Elevator

ELEVATOR SIMULATORModel No : (VBMB - 22)

Application Manual

Version 1.0

Technical Clarification /Suggestion :

/ Technical Support Division,

Vi Microsystems Pvt. Ltd.,Plot No :75, Electronics Estate,

Perungudi, Chennai - 600 096, INDIA.

Ph: 91- 44-2496 1842, 91-44-2496 1852

Mail : [email protected],

Web : www.vimicrosystem.com

CONTENTS

CHAPTER

CHAPTER 1:

1:1 Introduction ............................................................................... 1

1:2 Hardware specification and description ................................... 1

CHAPTER 2.

2:1 Circuit Implementation .............................................................. 2

2:2 Interrupt Driven Request Service .............................................. 5

2:3 Assignments and Operating Sequence ...................................... 6

CHAPTER 3. Examples and Exercises.

3.1 Example 1 - To move lift 1 to 4th floor

from ground floor ...................................................................... 9

3.2 Example 2 - To find the nearest lift for a

request from any floor ............................................................... 12

3.3 Example 3 - To service a request from any

floor to go to ground floor or 7th floor ....................................... 16

3.4 Example 4 - Interrupt Based Request

Service ...................................................................................... 23

3.5 Program in 8086 Assembly Language........................................ 30

3.6 Program in 8051 Assembly Language....................................... 41

LIST OF APPENDICES

APPENDIX-A CIRCUIT DIAGRAM ...................................................58

APPENDIX-B COMPONENT LAYOUT ............................................. 59

ELEVATOR SIMULATOR VBMB - 022

Vi Microsystems Pvt Ltd., [ 1 ]

CHAPTER 1

1.1 INTRODUCTION:

Microprocessor plays major role in modern control systems application. Elevator Control is one

such common application in practise. In practical Cases Motors and pnematic controllers are

operated and controlled by Programmable Logic Controllers. VBMB-022 simulates the methods

of implementing a Microprocessor Based elevator control in real world.

To simulates the Elevator Control we have Two columns of 8 LEDS each for indicating eight

different floors. The status of the elevator (whether it is open or closed) is indicated by a separate

LED for each Lift. To give request from 8 different floors, a separate preset thumb wheel switch

and an enter switch is provided. Also a Buzzer is provided to give, audible indication of request

pending, request serviced and so on.

1.2 HARDWARE SPECIFICATIONS OF VBMB-022:

* 8 floors and 2 lifts are assumed.

* Each Lift is represented by a column of 8 LEDs.

* Preset Thumbwheel switch is provided for the user to select the floor number.

* One momentary switch provided for the user to confirm their request input.

* Buzzer and LEDs are provided for Audible and Visual Error/status indication.

* Provision for interrupt driven request service.

* Two momentary switches provided for UP and DOWN movement request.



CHAPTER 2

2.1 CIRCUIT IMPLEMENTATION

The entire circuit can be subdivided into 4 different sections, for analysis.

1) Lift status/Error output Register.

2) Request Input Register.

3) I/O decoding.

4) Lift 1 and Lift 2 control registers.

i) LIFT STATUS /ERROR OUTPUT REGISTER

A latch 74LS273 (U6) is provided for status indication. Its I/O address is “CCH”, A

Buzzer and two LEDs are driven by the output of this latch. We can use these outputs for either

indicating the status of the lift door or for indicating the error conditions if any.

For example, a request from the user, say from 7th floor, requesting the service of the lift

to go to the same floor, can be prompted as an error by sounding the buzzer or by blinking the

LED through software. The status of the lift can also be indicated in this way. If the LED glows

it indicates that the lift door is open and if it does not glow, it indicates that the lift door is closed.

For example, assume that there is a request from 4th floor, requesting the service of the

lift to go to 7th floor. The lift is in Ground Floor. After sensing that there is a request from the 4th

floor, the lift door should be closed and the lift has to be moved to 4th floor. Then the lift door

should be opened to enable the user to enter into the lift. Now, after getting the input from the

user the lift door must be closed and then only the lift has be moved to the required floor (i.e. 7th

floor). A LED can be made to glow whenever the lift door is open. The same can be made OFF

whenever the lift door is closed. Through software, the various intermediate stages can also be

indicated. This is the functional description of the lift status/error output register.

ii) REQUEST INPUT REGISTER:

An octal buffer 74LS244 (U3) is employed to input the request. This register is mapped to the

I/O address “C8H”. A preset thumbwheel switch and three momentary (NC-NO) switches are

connected to the input of this buffer and the output is connected to the data bus. The three

momentary switches can be configured in any combination.

In real time application, each floor will be provided with separate input switches, for getting the

destination floor number from the user. In VBMB-022 since eight floors are assumed, separates

input switches for every floor is needed.

A preset thumbwheel switch for getting the floor number information from the user avoids the

problem of having different switches for individual floors. The thumbwheel switch has a knurled

wheel and letters 0 to 9 are marked in the front and the top panel. By turning the wheel, any

number from 0 to 9 can be selected. The following figure shows the appearance of the



thumbwheel switch. A confirmation switch or “ENTER” key is introduced to confirm the validity

of the number in the thumb wheel switch.

In VBMB-022 two common input switches are provided to give “UP” or “DOWN” input because

it would be a simple replica of the same circuit for all the floors.

By polling the request input register,the above mentioned user inputs can be obtained and

processed and the output is indicated through the lift control and status registers.

iii) I/O DECODING:

A 3 to 8 decoder 74LS138 (U2) and Quad NAND gate 74LS00 (U1) are employed in

VBMB-022 for selecting the various registers namely lift control, lift status and request input

registers.

Address lines A2,A3 and A4 are given to the A,B,C inputs of the decoder respectively. Then

IOR* (I/O Read and Write) and IOW* control signals from the CPU are Nanded and the Nand

gate’s output is given to the active high enable input and A5 is given to one of the active low

enable input while address lines A7 and A6 are nanded and the Nand gates the decoder. (Refer

Appendix for circuit diagram)

Thus lift1 control register is selected,

A7 A6 A5 A4 A3 A2 A1 A0

1 1 0 0 0 0 X X

With I/O address COH.

The lift2 control register is selected for I/O address C4H.



A7 A6 A5 A4 A3 A2 A2 A1

1 1 0 0 0 1 X X

The Request input register is selected for I/O address C8H

A7 A6 A5 A4 A3 A2 A2 A1

1 1 0 0 1 0 X X

The Status/Error output register is selected for I/O address CCH.

A7 A6 A5 A4 A3 A2 A2 A1

1 1 0 0 1 1 X X

iv) LIFT 1 AND LIFT 2 CONTROL REGISTERS:

The configuration of Lift 1 and Lift 2 control register is shown below. It is configured using

74LS273 Latch (U4) for Lift 1 and another 74LS273 (U5) for Lift2. In the control register

Databus D0 corresponds to 7th floor and D7 corresponds to Ground floor.

74LS273 is an octal ‘D’ latch and LEDs are connected to the output of all the ‘D’ latches. Each

LED glows when the corresponding data bit is high. By sending sequential data to the ‘D’ latch

we can simulate the movement of a lift from ground floor to 7th floor or vice versa. The I/O

address for both the control register can be had from section 2.2 of this manual.



2.2 INTERRUPT DRIVEN REQUEST SERVICE:

In VBMB-022, there are two ways of getting the request input.

i) Polled mode.

ii) Interrupt mode.

In polled mode, the request input register is polled continuously for a valid request. Valid

request present condition is sensed by monitoring the status of the confirmation switch or “Enter”

key. If a pulse is detected at the confirmation switch, then the thumbwheel switch setting can be

read and considered as valid. Further processing can be done there after.

The confirmation switch or Enter key can be connected to any of the following interrupt lines

of 8085 namely RST 5.5, RST 6.5 and RST 7.5. Since RST 7.5 & RST 6.5 are used by the

monitor, the buser can use the RST 5.5 line for interrupting the CPU. It is selectable by the

jumper J1. In interrupt mode, the used need not pole the request register.

Thus whenever the confirmation switch is pressed, the CPU is interrupted, and the CPU

knows that there is a valid input in the thumbwheel switch and it is read through the request

input register.

The jumper detail is given below. Refer component layout for locating the jumper.

NOTE: Place the shunt in position A for connecting RST 5.5 to the switch .

This option available for only VBMB -022 /Rev.1.



2.3 ASSIGNMENTS AND OPERATING SEQUENCE:

In this elevator simulator, we have assumed 2 lifts servicing a 7 storey building. ie. Ground floor

and seven other floors.

I/O address “0C0H” is being assigned for control register 1, which controls the movement of the

lift 1. Also we read that Databus ‘D7' corresponds to Ground floor and D0 corresponds to 7th

floor.If a data is sent to the port address,then LEDs corresponding to the data bits which are high

will glow, indicating the Lift Position.

The following table gives the Data to be written to the port address of Lift 1 and corresponding,

to simulate the position of the Lift in different floors.

Data Lift Position

80

40

20

10

08

04

02

01

Ground Floor

1st Floor

2nd Floor

3rd Floor

4th Floor

5th Floor

6th Floor

7th floor

Hence, sending data ‘80' to port address ‘0C0H’ makes the Ground Floor LED of Lift1 to glow.

After a delay if we output a data of ‘40' to the same port, makes the Floor 1 LED of the Lift 1 to

glow, indicating a movement of Lift 1 from ground floor to First floor. Similarly sending the

following sequence to port address ‘0C0H’, simulates the movement of Lift 1 from ground floor

to 7th floor.

80h,40h,20h,10h,08,04,02,01

Similarly Lift2 is configured to the port address 0C8H .The same procedure can be followed to

simulate the movement of Lift 2 also.



The following flow chart gives the details of request acknowledging and servicing method

clearly.



The procedure for simulating the Elevator Control is as follows.

a) The user has to give the floor number from where he is requesting by turning the

wheel of the thumbwheel switch until the required number appears in the front

panel of the switch.

b) Then press the “Enter” key to indicate that the thumbwheel switch has a valid

input.

c) The input will be acknowledge by the nearest Lift changing its position to the

requested floor. This is indicated by glowing the corresponding LED along with

a beep.

d) After getting the acknowledge, give the destination floor number through the

thumbwheel switch followed by the confirmation through the “ENTER” key.

e) If the request is a valid one, then it will be serviced which is indicated by the

movement of the lift from the current floor to the Required floor.

f) If the request is invalid, three beeps will be produced and then lift door will be

kept opened.



CHAPTER 3

SOFTWARE EXAMPLES

3.1 EXAMPLE-1:

AIM:

To show LIft1 to 4th floor from ground floor and give a beep.

DISCUSSION:

• Assume and initialize Lift1 in ground floor and Lift2 in 7th floor.

• Keep the doors of both the Lifts in open condition.

• To move Lift1 from ground floor to 4th floor, output the following sequence, with some

delay.

80,40,20,10,08

• After going to 4th floor the door of the Lift1 should be opened. This is done by outputting

data, “03" to port address “CCH”.

• To generate a beep sound, output data “OBH” to port address “CCH” and after a delay

output data,”03".

PROCEDURE:

i) Connect VBMB-022 board to any of our microprocessor trainer.

ii) Enter the following program starting from user RAM address 4100H, (for Micro-

85 kit, the starting of user RAM is address from 2000H and the following

program is to be modified).

iii) After checking the program, execute the same.

iv) We can see the movement of the Lift1 from ground floor to 4th floor.



PROGRAM:

;EXAMPLE-1

;SOFTWARE EXAMPLE TO MOVE

;LIFT1 TO 4TH FLOOR FROM

;GROUND FLOOR & OPEN THE DOOR

4100 ORG 4100H

C0 00 LIFT1 EQU 0C0H


C8 00 STAT _IN EQU 0C8H

CC 00 STAT_OU EQU 0CCH

4100 3E 03 START : MVI A,03 ; D E F A U L T O P E N

DOORS

4102 D3 CC OUT STA_OU ;OF LIFT1 & LIFT2

4104 CD 3B 41 CALL DELAY

4107 3E 02 MVI A,02 ;CLOSE DOOR OF LIFT1

4109 D3 CC OUT STA_OU

410B 3E 80 MVI A,80H ;INDICATES LIFT1 IS

410D D3 C0 OUT LIFT1 ;IN GROUND FLOOR

410F 3E 01 MVI A,01 ; INDICATES LIFT2 IS

4111 D3 C4 OUT LIFT2 ;IN 7TH FLOOR


4116 3E 40 MVI A,40H

4118 D3 CO OUT LIFT1

411A CD 3B 41 CALL DELAY

411D 3E 20 MVI A,20H

411F D3 C0 OUT LIFT1


4124 3E 10 MOV A,10H

4126 D3 C0 OUT LIFT1


412B 3E 08 MVI A,08H

412D D3 C0 OUT LIFT1

412F 3E 0B MVI A,0BH ;BEEP FOR DOOR OPEN

4131 D3 CC OUT STAT_OU


4136 3E 03 MVI A,03 ;OPEN DOORS


413A 76 HLT

413B 0E 02 DELAY: MVI C,02H ; D E L A Y F O R 1

SECOND

413D 11 FE F9 LOOP1: LXI D,F9FEH

4140 1B LOOP2: DCX D

4141 7A MOV A,D



4142 B3 ORA E

4143 C2 40 41 JNZ LOOP2

4146 0D DCR C

4147 C2 3D 41 JNZ LOOP1

414A C9 RET

414B END

EXERCISE:

Write a program to move the Lift2 to 4th floor from 7th floor.



3.2 EXAMPLE-2:

AIM:

To find the nearest lift for a request from any floor and service the request

DISCUSSION:

• As per the previous discussion the lifts are to be initialised..

• The request will be given by the user by setting the thumbwheel switch and will be

confirmed by pressing the “ENTER” key.

• This will be sensed by the program by polling the port address “C8H”.

• By an algorithm find the nearest Lift to the requested floor.

• Now move the Lift to the requested floor and give a beep, by standard procedures, already

explained.

• Give 3 beeps in case of an error condition.

PROCEDURE:

i) As per the previous example connect the card to the trainer.

ii) Enter the program starting from user RAM address 4100H and execute the same.

iii) Now, set the required floor number in the thumbwheel switch and press the

“ENTER” key for confirmation.

iv) See that the nearest lift will move to the requested floor, and the Lift door will be

opened with a beep.

PROGRAM:

;EXAMPLE-2

;SOFTWARE EXAMPLE TO FIND

;THE NEAREST LIFT FOR A

;REQUEST FROM ANY FLOOR



C8 00 STAT_IN EQU 0C8H


4100 ORG 4100H



4100 3E 03 START : MVI A,03 ;DEFAULT DOORS IS IN

4102 D3 CC OUT STAT_OU ;OPEN CONDITION

4104 3E 80 MVI A,80H ;ASSUME LIFT1 IS IN

4106 D3 C0 OUT LIFT1 ;GROUND FLOOR

4108 3E 01 MVI A,01H ;LIFT2 IS IN 7TH

410A D3 C4 OUT LIFT2 ;FLOOR

410C CD E1 41 CALL DELAY

410F DB C8 CHECK: IN STAT_IN

4111 E6 F0 ANI F0H

4113 FE E0 CPI E0H ;CHECK FOR ENTER

KEY.

4115 C2 0F 41 JNZ CHECK

4118 DB C8 IN STAT_IN

411A E6 0F ANI 0FH

411C FE 0F CPI 0FH ;CHECK IF IS GROUND

FLOOR

411E CA B7 41 JZ ERROR

4121 FE 08 CPI 08H

4123 DA B7 41 JC ERROR ;CHECK IF 8TH OR 9TH

;FLOOR

4126 CA B7 41 JZ ERROR ;CHECK IF 7TH FLOOR

4129 47 MOV B,A

412A FE 0C CPI 0CH ;FIND THE NEAREST

LIFT

412C DA 73 41 JC LIFTB

412F 3E 02 FLR_A: MVI A,02 ;CLOSE DOOR OF

LIFT1


4133 78 MOV A,B

4134 FE 0E CPI 0EH

4136 C2 40 41 JNZ FLR_B

4139 3E 40 MVI A,40H ;1ST FLOOR

413B D3 C0 OUT LIFT1

413D C3 65 41 JMP STAT

4140 FE 0D FLR_B: CPI ODH

4142 C2 53 41 JNZ FLR_C

4145 3E 40 MVI A,40H


4149 CD E1 41 CALL DELAY

414C 3E 20 MVI A,20H ;2ND FLOOR

414E D3 C0 OUT LIFT1

4150 C3 65 41 JMP STAT

4153 3E 40 FLR_C: MVI A,40H





415A 3E 20 MVI A,20H

415C D3 C0 OUT LIFT1

415E CD E1 41 CALL DELAY

4161 3E 10 MVI A,10H ;3RD FLOOR

4163 D3 C0 KYOUT LIFT1

4165 3E 0B STAT: MVI A,0BH ;TO OPEN THE DOOR

;OF LIFT1

4167 D3 CC OUT STA_OU ;& GIVE BEEP FOR 1

SEC


416C 3E 03 MVI A,03

416E D3 CC OUT STAT_OU

4173 3E 01 LIFTB: MVI A,01 ;CLOSE DOOR OF LIFT2


4177 78 MOV A,B

4178 FE 09 CPI 09H

417A C2 84 41 JNZ FLR_E

417D 3E 02 MVI A,02 ;FLOOR 6 OF LIFT2


4181 C3 A9 41 JMP STAT1

4184 FE 0A FLR_E CPI 0AH

4186 C2 97 41 JNZ FLR_D

4189 3E 02 MVI A,02 ;FLOOR 6 OF LIFT2


418D CD E1 41 CALL DELAY

4190 3E 04 MVI A,O4 ;FLOOR 5 0F LIFT2


4194 C3 A9 41 JMP STAT1

4197 3E 02 FLR_D MVI A,02


419B CD E1 41 CALL DELAY

419E 3E 04 MVI A,04

41A0 D3 C4 OUT LIFT2

41A2 CD E1 41 CALL DELAY

41A5 3E 08 MVI A,08H ;FLOOR 4 OF LIFT2


41A9 3E 0B START1: MVI A,0BH ;OPEN DOOR OF LIFT2

41AB D3 CC OUT STAT_OU ;& GIVE BEEP SOUND

41AD CD E1 41 CALL DELAY

41B0 3E 03 MVI A,03

41B2 D3 CC OUT STAT_OU

41B4 C3 F1 41 JMP STOP

41B7 3E 0B ERROR: MVI A,0BH ;GIVE THREE BEEP

41B9 D3 CC OUT STAT_OU ;SOUND INDICATES

41BB CD E1 41 CALL DELAY ;ERROR CONDITION



41BE 3E 03 MVI A,03

41C0 D3 CC OUT STAT_OU

41C2 CD E1 41 CALL DELAY

41C5 3E 0B MVI A,OBH

41C7 D3 CC OUT STAT_OU

41C9 CD E1 41 CALL DELAY

41CC 3E 03 MVI A,03

41CE D3 CC OUT STAT_OU

41D0 CD E1 41 CALL DELAY

41D3 3E 0B MVI A,0BH

41D5 D3 CC OUT STAT_OU

41D7 CD E1 41 CALL DELAY

41DA 3E 03 MVI A,03

41DC D3 CC OUT STAT_OU

41DE C3 F1 41 JMP STOP

41E1 0E 02 DELAY: MVI C,02 ;DELAY FOR 1SEC

41E3 11 FE F9 LOOP1: LXI D,F9FEH

41E6 1B LOOP2 DCX D

41E7 7A MOV A,D

41E8 B3 ORA E

41E9 C2 E6 41 JNZ LOOP2

41EC 0D DCR C

41ED C2 E3 41 JNZ LOOP1

41F0 C9 RET

41F1 76 STOP: HLT

41F2 END

EXERCISE:

Write a program to find the nearest lift for a request from any floor and go to ground floor.



3.3 EXAMPLE-3

AIM:

To service a request from any floor to go to ground floor or 7th floor.

DISCUSSION:

As per the previous discussion the lifts are to be initialized.

• The request will be given by the user by setting the thumbwheel switch and will be

confirmed by pressing the “ENTER” key.

• This will be sensed by the program by polling the port address “C8H”.

• By an algorithm find the nearest Lift to the requested floor.

• Now move the Lift to the requested floor and give a beep, by standard procedures,

already explained.

• Now polling the address “C8H” for an input from “UP” or “DOWN” key.

• Now move the lift to 7th floor by standard procedure if “UP” key is pressed and to ground

floor if “DOWN” key is pressed.

PROCEDURE:



iii) Now, set the required floor number in the thumbwheel switch and press the

“ENTER” key for confirmation.

iv) See that the nearest lift will move to the requested floor, and the Lift door will be

opened with a beep



PROGRAM:

;EXAMPLE-3

;SOFTWARE EXAMPLE TO SERVICE

;A REQUEST FROM 5TH FLOOR

;TO GO TO GROUND FLOOR





4100 ORG 4100H

4100 3E 03 START: MVI A,03 ;OPEN DOORS


4104 3E 80 MVI A,80H ;ASSUME LIFT IS IN




410C CD 19 43 CALL DELAY

410F DB C8 CHECK: IN STAT_IN

4111 E6 F0 ANI F0H

4113 FE E0 CPI E0H ;CHECK FOR ENTER KEY

4115 C2 0F 41 JNZ CHECK


411A E6 0F ANI 0FH

411C FE 0F CPI 0FH ;CHECK IF IS GRD FLR

411E CA EF 42 JZ ERROR

4121 FE 08 CPI 08H

4123 DA EF 42 JC ERROR ;CHECK IF 8TH OR

;9TH FLOOR

4126 CA EF 42 JZ ERROR ;CHECK IF 7TH FLOOR

4129 47 MOV B,A

412A FE 0C CPI 0CH ;FIND THE NEAREST LIFT

412C DA 15 42 JC LIFTB

412F 3E 02 FLR_A: MVI A,02 ;CLOSE THE DOOR OF LIFT


4133 78 MOV A,B

4134 FE 0E CPI 0EH

4136 C2 40 41 JNZ FLR_B



413D C3 65 41 JMP STAT

4140 FE 0D FLR_B: CPI 0DH

4142 C2 53 41 JNZ FLR_C

4145 3E 40 MVI A,40H




4149 CD 19 43 CALL DELAY

414C 3E 20 MVI A,20H ;2ND FLOOR


4150 C3 65 41 JMP STAT

4153 3E 40 FLR_C: MVI A,40H



415A 3E 20 MVI A,20H


415E CD 19 43 CALL DELAY



4165 47 STAT: MOV B,A

4166 3E 0B MVI A,0BH ;TO OPEN THE DOOR OF LIFT1


416A CD 19 43 CALL DELAY

416D 3E 03 MVI A , 03

416F D3 CC OUT STAT _OU

4171 DB C8 REPT: IN STAT_IN

4173 E6 F0 ANI F0H

4175 FE E0 CPI E0H

4177 D2 71 41 JNC REPT

417A 3E 02 MVI A , 02

417C D3 CC OUT STAT_OU

417E DB C8 IN STAT_IN

4180 E6 F0 ANI F0H

4182 FE D0 CPI D0H

4184 C2 B8 41 JNZ UP

4187 78 DOWN: MOV A,B

4188 FE 10 CPI 10H

418A C2 90 41 JNZ DOWN_B

418D C3 A0 41 JMP DWN_B

4190 FE 20 DOWN_B: CPI 20H

4192 C2 98 41 JNZ DOWN_A

4195 C3 A7 41 JMP DWN_A

4198 FE 40 DOWN_A: CPI 40H

419A C2 EF 42 JNZ ERROR

419D C3 AE 41 JMP DWN_GN

41A0 3E 20 DWN_B: MVI A,20H


41A4 CD 19 43 CALL DELAY

41A7 3E 40 DWN_A: MVI A,40H


41AB CD 19 43 CALL DELAY



41AE 3E 80 DWN_GN: MVI A,80H

41B0 D3 C0 OUT LIFT1

41B2 CD 19 43 CALL DELAY

41B5 C3 07 42 JMP STOP

41B8 FE B0 UP: CPI BOH ;CHECK F0 UP KEY

41BA C2 EF 42 JNZ ERROR

41BD 78 MOV A,B

41BE FE 40 CPI 40H

41C0 C2 C6 41 JNZ UPP_B

41C3 C3 DD 41 JMP UP_B

41C6 FE 20 UPP_B: CPI 20H

41C8 C2 CE 41 JNZ UPP_C

41CB C3 E4 41 JMP UP_C

41CE FE 10 UPP_C: CPI 10H

41D0 C2 EF 42 JNZ ERROR

41D3 C3 EB 41 JMP UP_D

41D6 3E 40 MVI A,40H ;UP_A:

41D8 D3 C0 OUT LIFT1

41DA CD 19 43 CALL DELAY

41DD 3E 20 UP_B: MVI A,20H

41DF D3 C0 OUT LIFT1

41E1 CD 19 43 CALL DELAY

41E4 3E 10 UP_C: MVI A,10H

41E6 D3 C0 OUT LIFT1


41EB 3E 08 UP_D: MVI A,08

41ED D3 C0 OUT LIFT1

41EF CD 19 43 CALL DELAY

41F2 3E 04 MVI A,04 ;UP_E:

41F4 D3 C0 OUT LIFT1

41F6 CD 19 43 CALL DELAY

41F9 3E 02 MVI A,02 ;UP_F:

41FB D3 C0 OUT LIFT1

41FD CD 19 43 CALL DELAY

4200 3E 01 MVI A,01 ;UP_G:

4202 D3 C0 OUI LIFT1


4207 3E 0B STOP: MVI A,0BH


420B CD 19 43 CALL DELAY

420E 3E 03 MVI A,01


4212 C3 29 43 JMP END

4215 3E 01 LIFTB: MVI A,01




4219 78 MOV A,B

421A FE 09 CPI 09H

421C C2 26 42 JNZ FLR_E

421F 3E 02 MVI A,02 ;FLOOR 6 OF LIFT2


4223 C3 4B 42 JMP STAT_S

4226 FE 0A FLR_E: CPI 0AH

4228 C2 39 42 JNZ FLR_D

422B 3E 02 MVI A,02


422F CD 19 43 CALL DELAY



4236 C3 4B 42 JMP STAT_S

4239 3E 02 FLR_D: MVI A,02


423D CD 19 43 CALL DELAY

4240 3E 04 MVI A,04



4247 3E 08 MVI A,08H ;FLOOR 4 OF LIFT2


424B 47 STAT_S: MOV B, A

424C 3E 0B MVI A,0BH

424E D3 CC OUT STAT_OU


4253 3E 03 MVI A,03


4257 DB C8 REPT_S: IN STAT_IN

4259 E6 F0 ANI F0H

425B FE E0 CPI E0H

425D D2 57 42 JNC REPT_S




4266 E6 F0 ANI F0H

4268 FE D0 CPI D0H

426A C2 AE 42 JNZ UP_S

426D 78 DOWN_S: MOV A,B

426E FE 02 CPI 02

4270 C2 76 42 JNZ FLO_E

4273 C3 81 42 JMP FL_E

4276 FE 04 FLO_E: CPI 04

4278 C2 7E 42 JNZ FLO_D

427B C3 81 42 JMP FL_D



427E C3 8F 42 FLO_D: JMP FL_C

4281 3E 04 FL_E: MVI A,04



4288 3E 08 FL_D: MVI A,08

428A D3 C4 OUT LIFT2


428F 3E 10 FL_C: MVI A,10H



4296 3E 20 MVI A,20H ;FL_B



429D 3E 40 MVI A,40H ;FL_A



42A4 3E 80 MVI A,80H ;FL_GN



42AB C3 E1 42 JMP STOP_S

42AE FE B0 UP_S: CPI B0H

42B0 C2 AE 42 JNZ UP_S

42B3 78 MOV A,B

42B4 FE 08 CPI 08

42B6 C2 BC 42 JNZ U_E

42B9 C3 CC 42 JMP UO_E

42BC FE 04 U_E: CPI 04

42BE C2 C4 42 JNZ U_F

42C1 C3 D3 42 JMP U0_F

42C4 FE 02 U_F: CPI 02

42C6 C2 EF 42 JNZ ERROR

42C9 C3 DA 42 JMP UO_G

42CC 3E 04 UO_E: MVI A,04

42CE D3 C4 OUT LIFT2

42D0 CD 19 43 CALL DELAY

42D3 3E 02 UO_F: MVI A,02



42DA 3E 01 UO_G: MVI A,01

42DC D3 C4 OUT LIFT2

42DE CD 19 43 CALL DELAY

42E1 3E 0B STOP_S: MVI A,0BH

42E3 D3 CC OUT STAT_OU


42E8 3E 03 MVI A,03



42EA D3 CC OUT STAT_OU

42EC C3 29 43 JMP END

42EF 3E 0B ERROR: MVI A,0BH

42F1 D3 CC OUT STAT_OU


42F6 3E 03 MVI A,03


42FA CD 19 43 CALL DELAY

42FD 3E 0B MVI A,0BH

42FF D3 CC OUT STAT_OU


4304 3E 03 MVI A,03



430B 3E 0B MVI A,0BH

430D D3 CC OUT STAT_OU


4312 3E 03 MVI A,03


4316 C3 29 43 JMP END

4319 0E 02 DELAY: MVI C,02 ;DELAY FOR 1 SECOND

431B 11 FE F9 LOOP1: LXI D,F9FEH

431E 1B LOOP2: DCX D

431F 7A MOV A,D

4320 B3 ORA E

4321 C2 1E 43 JNZ LOOP2

4324 0D DCR C

4325 C2 1B 43 JNZ LOOP1

4328 C9 RET

4329 76 END: HLT

432A END

EXERCISE:

Write a program to service a request from any floor to goto any floor.



3.4 EXAMPLE-4

To service a request using Interrupts in 8085 [Available only in VBMB-022/Rev.1]

DISCUSSION:

• By proper jumper selection, we can connect the output of the Enter Key to the RST 5.5

(or) RST 6.5 (or) RST 7.5.

• The initialisation for interrupt is done such that upon pressing “Enter” key, the

Microprocessor will go to the memory location 5000H.

• The Interrupt Service Routine (ISR) placed at 5000H, inputs the data from the

thumbwheel switch and service the request as explained in the previous example.

PROCEDURE:

i) Connect the card to the trainer as per the previous procedure.

ii) Enter the following program starting from user RAM address 4100H. Also enter

the ISR starting from 5000H.

iii) Place the shunt in position A for enabling RST 5.5.

iv) Press the Enter Key after setting the thumbwheel switch.

v) We can see the result in the LEDs as per the previous example.



PROGRAM:

;EXAMPLE-4

;SOFTWARE EXAMPLE TO STUDY

;ABOUT INTERRUPT BASED

;REQUEST SERVICE





4100 ORG 4100H

4100 3E 03 START: MVI A,03 ;OPEN DOOR OF LIFT1 & 2


4104 3E 80 MVI A,80H ;ASSUME LIFT1 IS IN





410F F3 CHECK: DI

4110 3E 08 MVI A,08

4112 30 SIM ;CHECK FOR RST5.5

4113 FB EI

4114 76 HLT

5000 ORG 5000H

5000 DB C8 START1: IN STAT_IN

5002 E6 0F ANI 0FH

5004 FE 0F CPI 0FH

5006 CA D7 51 JZ ERROR ;CHECK IF IS GRUD FLR

5009 FE 08 CPI 08H

500B DA D7 51 JC ERROR ;CHECK IF 8TH OR

;9TH FLOOR

500E CA D7 51 JZ ERROR ;CHECK IF 7TH FLOOR

5011 47 MOV B,A

5012 FE 0C CPI 0CH ;FIND THE NEAREST LIFT

5014 DA FD 50 JC LIFTB

5017 3E 02 FLR_A: MVI A,02 ;CLOSE THE DOOR OF LIFT2


501B 78 MOV A,B

501C FE 0E CPI 0EH

501E C2 28 50 JNZ FLR_B



5025 C3 4D 50 JMP STAT

5028 FE 0D FLR _B: CPI 0DH

502A C2 3B 50 JNZ FLR_C



502D 3E 40 MVI A,40H



5034 3E 20 MVI A,20H ;2ND FLOOR


5038 C3 4D 50 JMP STAT

503B 3E 40 FLR_C MVI A,40H



5042 3E 20 MVI A,20H





504D 47 STAT: MOV B,A

504E 3E 0B MVI A,0BH ;TO OPEN THE DOOR

;OF LIFT1



5055 3E 03 MVI A,03


5059 DB C8 REPT: IN STAT_IN

505B E6 F0 ANI F0H

505D FE E0 CPI E0H ;CHECK FOR UP OR DOWN

505F D2 59 50 JNC REPT ;KEY PRESS




5068 E6 F0 ANI F0H

506A FE D0 CPI D0H

506C C2 A0 50 JNZ UP

506F 78 DOWN: MOV A,B

5070 FE 10 CPI 10H

5072 C2 78 50 JNZ DOWN_B

5075 C3 88 50 JMP DWN_B

5078 FE 20 DOWN_B: CPI 20H

507A C2 80 50 JNZ DOWN_A

507D C3 8F 50 JMP DWN_A

5080 FE 40 DOWN_A: CPI 40H

5082 C2 D7 51 JNZ ERROR

5085 C3 96 50 JMP DWN_GN

5088 3E 20 DOWN_B: MVI A,20H



508F 3E 40 DWN_A: MVI A,40H





5096 3E 80 DWN_GN: MVI A,80H



509D C3 EF 50 JMP STOP

50A0 FE B0 UP: CPI B0H ;CHECK FOR UP KEY

50A2 C2 D7 51 JNZ ERROR

50A5 78 MOV A,B

50A6 FE 40 CPI 40H

50A8 C2 AE 50 JNZ UPP_B

50AB C3 C5 50 JMP UP_B

50AE FE 20 UPP_B: CPI 20H

50B0 C2 B6 50 JNZ UPP_C

50B3 C3 CC 50 JMP UP_C

50B6 FE 10 UPP_C: CPI 10H

50B8 C2 D7 51 JNZ ERROR

50BB C3 D3 50 JMP UP_D

50BE 3E 40 MVI A,40H ;UP_A:

50C0 D3 C0 OUT LIFT1

50C2 CD 01 52 CALL DELAY

50C5 3E 20 UP_B: MVI A,20H



50CC 3E 10 UP_C: MVI A,10H

50CE D3 C0 OUT LIFT1


50D3 3E 08 UP_D: MVI A,08



50DA 3E 04 MVI A,04 ;UP_E:

50DC D3 C0 OUT LIFT1

50DE CD 01 52 CALL DELAY

50E1 3E 02 MVI A,02 ;UP_F:

50E3 D3 C0 OUT LIFT1


50E8 3E 01 MVI A,01 ;UP_G:

50EA D3 C0 OUT LIFT1

50EC CD 01 52 CALL DELAY

50EF 3E 0B STOP: MVI A,0BH ;OPEN DOOR OF LIFT1

50F1 D3 CC OUT STAT_OU ;& GIVE ONE BEEP SOUND


50F6 3E 03 MVI A,03


50FA C3 11 52 JMP END



50FD 3E 01 LIFTB: MVI A,01 ;CLOSE DOOR OF LIFTB

50FF D3 CC OUT STAT_OU

5101 78 MOV A,B

5102 FE 09 CPI 09H

5104 C2 0E 51 JNZ FLR_E



510B C3 33 51 JMP STAT_S

510E FE 0A FLR_E: CPI 0AH

5110 C2 21 51 JNZ FLR_D

5113 3E 02 MVI A,02



511A 3E 04 MVI A,04 ;FLOOR 5 OF LIFT2


511E C3 33 51 JMP STAT_S

5121 3E 02 FLR_D: MVI A,02



5128 3E 04 MVI A,04


512C CD 01 52 CALL DELAY ;FLOOR4OF LIFT2

512F 3E 08 MVI A,08H ;FLOOR 4 OF LIFT2


5133 47 STAT_S: MOV B,A

5134 3E 0B MVI A,0BH



513B 3E 03 MVI A,03

513D D3 CC OUT STAT_OU

513F DB C8 REPT_S: IN STAT_IN

5141 E6 F0 ANI F0H

5143 FE F0 CPI E0H

5145 D2 3F 51 JNC REPT_S

5148 3E 01 MVI A,01 ;CLOSE DOOR OF LIFT 2

514A D3 CC OUT STAT_OU

514C DB C8 IN STAT_IN

514E E6 F0 ANI F0H

5150 FE D0 CPI DOH

5152 C2 96 51 JNZ UP_S

5155 78 DOWN_S: MOV A,B

5156 FE 02 CPI 02

5158 C2 5E 51 JNZ FLO_E

515B C3 69 51 JMP FL_E

515E FE 04 FLO_E: CPI 04



5160 C2 66 51 JNZ FLO_D

5163 C3 70 51 JMP FL_D

5166 C3 77 51 FLO_D: JMP FL_C

5169 3E 04 FL_E: MVI A,04


516D CD 01 52 CALL DELAY

5170 3E 08 FL_D: MVI A,08



5177 3E 10 FL_C: MVI A,10H


517B CD 01 52 CALL DELAY

517E 3E 20 MVI A,20H ;FL_B:



5185 3E 40 MVI A,40H ;FL_A:



518C 3E 80 MVI A,80H ;FL_GN



5193 C3 C9 51 JMP STOP_S

5196 FE BO UP_S: CPI B0H

5198 C2 96 51 JNZ UP_S

519B 78 MOV A,B

519C FE 08 CPI 08

519E C2 A4 51 JNZ U_E

51A1 C3 B4 51 JMP UO_E

51A4 FE 04 U_E: CPI 04

51A6 C2 AC 51 JNZ U_F

51A9 C3 BB 51 JMP UO_F

51AC FE 02 U_F: CPI 02

51AE C2 D7 51 JNZ ERROR

51B1 C3 C2 51 JMP UO_G

51B4 3E 04 UO_E: MVI A,04

51B6 D3 C4 OUT LIFT2

51B8 CD 01 52 CALL DELAY

51BB 3E 02 UO_F: MVI A,02

51BD D3 C4 OUT LIFT2

51BF CD 01 52 CALL DELAY

51C2 3E 01 UO_G: MVI A,01



51C9 3E 0B STOP_S: MVI A,0BH

51CB D3 CC OUT STAT_OU



51CD CD 01 52 CALL DELAY

51D0 3E 03 MVI A,03


51D4 C3 11 52 JMP END

51D7 3E 0B ERROR: MVI A,0BH ;ONE BEEP


51DB CD 01 52 CALL DELAY

51DE 3E 03 MVI A,03



51E5 3E 0B MVI A,0BH ;SECOND BEEP



51EC 3E 03 MVI A,03

51EE D3 CC OUT STAT_OU


51F3 3E 0B MVI A,0BH ;THIRD BEEP



51FA 3E 03 MVI A,03

51FC D3 CC OUT STAT_OU

51FE C3 11 52 JMP END

5201 0E 02 DELAY: MVI C,02 ;DELAY FOR 1SEC

5203 11 FE F9 LOOP1: LXI D,F9FEH

5206 1B LOOP2: DCX D

5207 7A MOV A,D

5208 B3 ORA E

5209 C2 06 52 JNZ LOOP2

520C 0D DCR C

520D C2 03 52 JNZ LOOP1

5210 C9 RET

5211 76 END: HLT

5212 END



3.5 PROGRAM FOR VBMB-022 (ELEVATOR INTERFACE) IN 8086 ASSEMBLY

LANGUAGE:

EXAMPLE 1:

AIM:

TO MOVE THE LIFT1 TO 4TH FLOOR AND TO GIVE A BEEP.

PROGRAM:

00C0 LIFT1 EQU 00C0H


00C8 STIN EQU 00C8H

00CC STOU EQU 00CCH

1000 ORG 1000H

START:

1000 B0 03 MOV AL,03H ;DEFAULT OPEN

1002 E6 CC OUT STOU,AL ;DOORS OF LIFIT1

1004 E8 34 00 CALL DELAY ;AND LIFT2

1007 B0 02 MOV AL,02H ;CLOSE DOOR OF

1009 E6 CC OUT STOU,AL

100B B0 80 MOV AL,80H ;INDICATE LIFT1

100D E6 C0 OUT LIFT1,AL ;IS IN GND FLOOR

100F B0 01 MOV AL,01H ;INDICATE LIFT2

1011 E6 C4 OUT LIFT2,AL ;IS IN 7TH FLOOR

1013 E8 25 00 CALL DELAY

1016 B0 40 MOV AL,40H ;LIFT IN FIRST FLOOR

1018 E6 C0 OUT LIFT1,AL

101A E8 1E 00 CALL DELAY

101D B0 10 MOV AL,20H ;LIFT1 IN

101F E6 C0 OUT LIFT1,AL ;SECOND FLOOR AND FLOOR


1024 B0 10 MOV AL,10H ;LIFT IN

1026 E6 C0 OUT LIFT1,AL ;THIRD FLOOR


102B B0 08 MOV AL,08H ;LIFT1 IN

102D E6 C0 OUT LIFT1,AL ;FOURTH FLOOR

102F B0 0B MOV AL,0BH ;BEEP FOR DOOR

1031 E6 CC OUT STOU,AL ;OPEN


1036 B0 03 MOV AL,03H ;OPEN DOOR


103A F4 HLT

DELAY:



103B B1 02 MOV CL,02H ;DELAY FOR ONE

LOOP1:

103D DB FE F9 MOV BX,0F9FEH

LOOP:

1040 4B DEC BX

1041 8A C3 MOV AL,BL

1043 0A C7 OR AL,BH

1045 75 F9 JNZ LOOP

1047 FE C9 DEC CL

1049 75 F2 JNZ LOOP1

104B C3 RET

104C END



EXAMPLE 2

AIM:

TO FIND THE NEAREST LIST FOR A REQUEST FOR ANY FLOOR.

PROGRAM:



00C8 LIFTIN EQU 00C8H

00CC STOU EQU 00CCH

1000 ORG 1000H

ADDRESS OPCODES MNEMONICS

START:

1000 B0 03 MOV AL,03 ;DEFAULT OPEN

1002 E6 CC OUT STOU,AL ;DOORS OF LIFIT1AND LIFT2

1004 B0 80 MOV AL,80 ;INDICATE LIFT1 IN GND FLOOR

1006 E6 C0 OUT LIFT1,AL ;INDICATE LIFT2 IN 7TH FLOOR

1008 B0 01 MOV AL,01

100A E6 C4 OUT LIFT2,AL

100C E8 CA 00 CALL DELAY

CHECK:

100F E4 C8 IN AL,LIFTIN

1011 24 F0 AND AL,F0

1013 3C E0 CMP AL,E0

1015 75 F8 JNZ CHECK

1017 E4 C8 IN AL,LIFTIN

1019 24 0F AND AL,0F

101B 3C 0F CMP AL,0F

101D 74 08 JZ FIX0

101F 3C 08 CMP AL,08

1021 72 04 JB FIX0

1023 74 02 JZ FIX0

1025 EB 03 JMP FIX1

FIX0:

1027 E9 86 00 JMP ERR

FIX1:

102A 8A D8 MOV BL,AL



102C 3C 0C CMP AL,0C

102E 72 40 JB LIFTB

FLR_A:

1030 B0 02 MOV AL,02 ;CLOSE DOOR OF LIFT1



1036 3C 0E CMP AL,0E

1038 75 06 JNZ FLRB

103A B0 40 MOV AL,40 ;LIFT1 IN FIRST FLOOR

103C E6 C0 OUT LIFT1,AL

103E EB 23 JMP STAT

FLR_B:

1040 3C 0D CMP AL,0D

1042 75 0D JNZ FLRC

1044 B0 40 MOV AL,40


1048 E8 8E 00 CALL DELAY

104B B0 20 MOV AL,20 ;LIFT1 IN 2ND FLOOR

104D E6 C0 OUT LIFT1,AL

104F EB 12 JMP STAT

FLR_C:

1051 B0 40 MOV AL,40



1058 B0 20 MOV AL,20 ;LIFT1 IN 3RD FLOOR


105C E8 7A 00 CALL DELAY

105F B0 10 MOV AL,10


STAT:

1063 B0 0B MOV AL,0B


1067 E8 6F 00 CALL DELAY

106A B0 03 MOV AL,03

106C E6 CC OUT STOU,AL

106E EB 7A JMP STOP

LIFTB:

1070 B0 01 MOV AL,01



1076 3C 09 CMP AL,09

1078 75 06 JNZ FLRE

107A B0 02 MOV AL,02


107E EB 23 JMP STAT1



FLRE:

1080 3C 0A CMP AL,0A

1082 75 0D JNZ FLRD

1084 B0 02 MOV AL,02



108B B0 04 MOV AL,04


108F EB 12 JMP STAT1

FLRD:

1091 B0 02 MOV AL,02



1098 B0 04 MOV AL,04


109C E8 3A 00 CALL DELAY

109F B0 08 MOV AL,08 ;LIFT2 IN 4TH FLOOR

10A1 E6 C4 OUT LIFT2,AL

STAT1:

10A3 B0 0B MOV AL,0B ;BEEP FOR DOOR

10A5 E6 CC OUT STOU,AL

10A7 E8 2F 00 CALL DELAY

10AA B0 03 MOV AL,03 ;OPEN DOOR

10AC E6 CC OUT STOU,AL

10AE EB 3A JMP STOP

ERR:

10B0 B0 0B MOV AL,0B

10B2 E6 CC OUT STOU,AL

10B4 E8 22 00 CALL DELAY

10B7 B0 03 MOV AL,03

10B9 E6 CC OUT STOU,AL

10BB E8 1B 00 CALL DELAY

10BE B0 0B MOV AL,0B

10C0 E6 CC OUT STOU,AL

10C2 E8 14 00 CALL DELAY

10C5 B0 03 MOV AL,03

10C7 E6 CC OUT STOU,AL

10C9 E8 0D 00 CALL DELAY

10CC B0 0B MOV AL,0B

10CE E6 CC OUT STOU,AL

10D0 E8 06 00 CALL DELAY

10D3 B0 03 MOV AL,03

10D5 E6 CC OUT STOU,AL

10D7 EB 11 JMP STOP



DELAY:

10D9 B1 02 MOV CL,02

LOOP1:

10DB BB FE F9 MOV BX,F9FE

LOOP2:

10DE 4B DEC BX

10DF 8A C3 MOV AL,BL

10E1 0A C7 OR AL,BH

10E3 75 F9 JNZ LOOP2

10E5 FE C9 DEC CL

10E7 75 F2 JNZ LOOP1

10E9 C3 RET

STOP:

10EA F4 HLT



EXAMPLE-3:

AIM:

PROGRAM FOR SERVICE A REQUEST FROM ANY FLOOR TO GO GROUND FLOOR

OR 7TH FLOOR

PROGRAM:



00C8 STIN EQU 00C8H

00CC STOU EQU 00CCH

1000 ORG 1000H

1000 B0 03 START: MOV AL,03 ;OPEN DOORS


1004 B0 80 MOV AL,80H ;ASSUME LIFT1 IS IN

1006 E6 C0 OUT LIFT1,AL ;GROUND FLOOR

1008 B0 01 MOV AL,01H ;LIFT2 IS IN 7TH FLOOR


100C E8 14 02 CALL DELAY

100F E4 C8 CHECK: IN AL,STIN

1011 24 F0 AND AL,0F0H ;CHECK FOR ENTER KEY

1013 3C E0 CMP AL,0E0H

1015 75 F8 JNZ CHECK

1017 E4 C8 IN AL,STIN

1019 24 0F AND AL,0FH

101B 3C 0F CMP AL,0FH

101D 74 09 JZ FIX0

101F 3C 08 CMP AL,08H

1021 72 05 JC FIX0 ;CHECK IF 8TH OR 9TH FLOOR

1023 74 03 JZ FIX0 ;CHECK IF 7TH FLOOR

1025 EB 04 90 JMP FIX5

1028 E9 CE 01 FIX0: JMP ERR

102B 8A D8 FIX5: MOV BL,AL

102D 3C 0C CMP AL,0CH ;FIND THE NEAREST FLOOR

102F 72 03 JC FIX4

1031 EB 04 90 JMP FLRA

1034 E9 E8 00 FIX4: JMP LIFTB

1037 B0 02 FLRA: MOV AL,02H ;CLOSE THE DOOR OF LIFT1


103B 8A C3 MOV AL,BL



103D 3C 0E CMP AL,0EH

103F 75 07 JNZ FLRB

1041 B0 40 MOV AL,40H ;1ST FLOOR


1045 EB 22 90 JMP STAT

1048 3C 0D FLRB: CMP AL,0DH

104A 75 0E JNZ FLRC

104C B0 40 MOV AL,40H

104E E6 C0 OUT LIFT1,AL

1050 E8 D0 01 CALL DELAY

1053 B0 20 MOV AL,20H ;2ND FLOOR


1057 EB 10 90 JMP STAT

105A B0 40 FLRC: MOV AL,40H


105E E8 C2 01 CALL DELAY

1061 B0 20 MOV AL,20H


1065 B0 10 MOV AL,10H ;3RD FLOOR


1069 8A D8 STAT: MOV BL,AL

106B B0 0B MOV AL,0BH ;TO OPEN THE DOOR OF LIFT1

106D E6 CC OUT STOU,AL

106F E8 B1 01 CALL DELAY

1072 B0 03 MOV AL,03H


1076 E4 C8 REPT: IN AL,STIN

1078 24 F0 AND AL,0F0H

107A 3C 0E CMP AL,0EH

107C 73 F8 JNC REPT

107E B0 02 MOV AL,02H



1084 24 F0 AND AL,0F0H

1086 3C D0 CMP AL,0D0H

1088 75 32 JNZ UP

108A 8A C3 DOWN: MOV AL,BL

108C 3C 10 CMP AL,10H

108E 75 03 JNZ DOWNB

1090 EB 12 90 JMP DWNB

1093 3C 20 DOWNB: CMP AL,20H

1095 75 03 JNZ DOWNA

1097 EB 12 90 JMP DWNA

109A 3C 40 DOWNA: CMP AL,40H

109C 75 03 JNZ FIX3



109E EB 12 90 JMP DWNGN

10A1 E9 55 01 FIX3: JMP ERR

10A4 B0 20 DWNB: MOV AL,20H


10A8 E8 78 01 CALL DELAY

10AB B0 40 DWNA: MOV AL,40H

10AD E6 C0 OUT LIFT1,AL

10AF E8 71 01 CALL DELAY

10B2 B0 80 DWNGN: MOV AL,80H

10B4 E6 C0 OUT LIFT1,AL

10B6 E8 6A 01 CALL DELAY

10B9 EB 56 90 JMP STOP

10BC 3C B0 UP: CMP AL,0B0H ;CHECK TO UP KEY

10BE 75 03 JNZ FIX2

10C0 EB 04 90 JMP FIX6

10C3 E9 33 01 FIX2: JMP ERR

10C6 8A C3 FIX6: MOV AL,BL

10C8 3C 40 CMP AL,40H

10CA 75 03 JNZ UPPB

10CC EB 19 90 JMP UPB

10CF 3C 20 UPPB: CMP AL,20H

10D1 75 03 JNZ UPPC

10D3 EB 19 90 JMP UPC

114E E6 C4 OUT LIFT2,AL

1150 E8 D0 00 CALL DELAY

1153 B0 08 MOV AL,08H ;FLOOR 4 OF LIFT2


1157 8A D8 STATS: MOV BL,AL

1159 B0 0B MOV AL,0BH

115B E6 CC OUT STOU,AL

115D E8 C3 00 CALL DELAY

1160 B0 03 MOV AL,03H

1162 E6 CC OUT STOU,AL ;CLOSE DOOR OF LIFT2

1164 E4 C8 REPTS: IN AL,STIN

1166 24 F0 AND AL,0F0H

1168 3C E0 CMP AL,0E0H

116A 73 F8 JNC REPTS

116C B0 01 MOV AL,01H

116E E6 CC OUT STOU,AL


1172 24 F0 AND AL,0F0H

1174 3C D0 CMP AL,0D0H

1176 75 40 JNZ UPS

1178 8A C3 DOWNS: MOV AL,BL

117A 3C 02 CMP AL,02H



117C 75 03 JNZ FLOE

117E EB 0B 90 JMP FLE

1181 3C 04 FLOE: CMP AL,04H

1183 75 03 JNZ FLOD

1185 EB 0B 90 JMP FLD

1188 EB 0F 90 FLOD JMP FLC

118B B0 04 FLE: MOV AL,04H


118F E8 91 00 CALL DELAY

1192 B0 08 FLD: MOV AL,08H


1196 E8 8A 00 CALL DELAY

1199 B0 10 FLC: MOV AL,10H

119B E6 C4 OUT LIFT2,AL

119D E8 83 00 CALL DELAY

11A0 B0 20 MOV AL,20H


11A4 E8 7C 00 CALL DELAY

11A7 B0 40 MOV AL,40H


11AB E8 75 00 CALL DELAY

11AE B0 80 MOV AL,80H

11B0 E6 C4 OUT LIFT2,AL

11B2 E8 6E 00 CALL DELAY

11B5 EB 31 90 JMP STOPS

11B8 3C B0 UPS: CMP AL,0B0H

11BA 75 FC JNZ UPS

11BC 8A C3 MOV AL,BL

11BE 3C 08 CMP AL,80H

11C0 5 03 JNZ UE

11C2 EB 0F 90 JMP UOE

11C5 3C 04 UE: CMP AL,04H

11C7 75 03 JNZ UF

11C9 EB 0F 90 JMP UOF

11CC 3C 02 UF: CMP AL,02H

11CE 75 29 JNZ ERR

11D0 EB 0F 90 JMP UOG

11D3 B0 04 UOE: MOV AL,04H

11D5 E6 C4 OUT LIFT2,AL

11D7 E8 49 00 CALL DELAY

11DA B0 02 UOF: MOV AL,02H

11DC E6 C4 OUT LIFT2,AL

11DE E8 42 00 CALL DELAY

11E1 B0 01 UOG: MOV AL,01H

11E3 E6 C4 OUT LIFT2,AL



11E5 E8 3B 00 CALL DELAY

11E8 B0 0B STOPS: MOV AL,0BH

11EA E6 CC OUT STOU,AL

11EC E8 34 00 CALL DELAY

11EF B0 03 MOV AL,03H

11F1 E6 CC OUT STOU,AL

11F3 E8 2D 00 CALL DELAY

11F6 EB 3C 00 JMP END

11F9 B0 0B ERR: MOV AL,0BH

11FB E6 CC OUT STOU,AL

11FD E8 23 00 CALL DELAY

1200 B0 03 MOV AL,03H


1204 E8 1C 00 CALL DELAY

1207 B0 OB MOV AL,0BH


120B E8 15 00 CALL DELAY

120E B0 03 MOV AL,03H



1215 B0 0B MOV AL,0BH



121C B0 03 MOV AL,03H

121E E6 CC OUT STOU,AL

1220 EB 12 90 JMP END

1223 DELAY:

1223 B1 02 MOV CL,02H ;DELAY FOR ONE SECOND 1225

LOOP1:

1225 BB FE F9 MOV BX,0F9FEH

1228 LOOP2:

1228 4B DEC BX


122B 0A C7 OR AL,BH

122D 75 F9 JNZ LOOP2

122F FE C9 DEC CL

1231 75 F2 JNZ LOOP1

1233 C3 RET

1234 END: HLT



3.6 PROGRAMS IN 8051 ASSEMBLY LANGUAGE

EXAMPLE-1:

PROGRAM FOR MOVING THE LIFT1 TO 4 FLOOR FROM GROUND FLOOR.

AIM:

To move to 4th floor ground floor and give a beep.

DISCUSSION:

* Assume and initialize Lift1 in ground floor and Lift2 in 7th floor.

* Keep the doors of both the lifts in open condition.

* To move Lift1 from ground floor to 4th floor, output the flowing sequence, with some delay.

80,40,20,10,08

* After going to 4th floor the door of the lift1 should be opened. This is done by outputting data,

“03" to port “CCH”.

* To generate a beep sound, output data “0BH” to port address “CCH” and after a delay output

data “03".

PROCEDURE:

i) Connect VBMB-022 board to any of our microcontroller Trainer.

ii) Enter the following program from user RAM address 4100H.

iii) After checking the program, execute the same.

iv) We can see the movement of the lift1 from ground floor to 4th floor.



PROGRAM:

0001 T0_M1 EQU 01H

0030 COUNT EQU 30H

0031 COUNT1 EQU 31H

FFC0 LIFT1 EQU 0FFC0H


FFC8 STAT_IN EQU 0FFC8H

FFCC STAT_OU EQU 0FFCCH

4100 ORG 4100H

4100 START:

4100 74 03 MOV A,#03H ; D E F A U L T O P E N

DOORS

4102 90 FF CC MOV DPTR,#STAT_OU ; O F L I F T 1 &

LIFT2

4105 F0 MOVX @DPTR,A

4106 12 41 41 CALL DELAY

4109 74 02 MOV A,#02H ;CLOSE DOOR OF LIFT1

410B F0 MOVX @DPTR,A

410C 74 80 MOV A,#80H ;INDICATES LIFT1 IS

410E 90 FF C0 MOV DPTR,#LIFT1 ;IN GND FLOOR


4112 74 01 MOV A,#01H ;INDICATES LIFT2 IS

4114 90 FF C4 MOV DPTR,#LIFT2 ;IN 7TH FLOOR


4118 12 41 41 CALL DELAY

411B 90 FF C0 MOV DPTR,#LIFT1

411E 74 40 MOV A,#40H


4121 12 41 41 CALL DELAY

4124 74 20 MOV A,#20H


4127 12 41 41 CALL DELAY

412A 74 10 MOV A,#10H

412C F0 MOVX @DPTR,A

412D 12 41 41 CALL DELAY

4130 74 08 MOV A,#08H


4133 74 0B MOV A,#0BH ;BEEP FOR DOOR OPEN

4135 90 FF CC MOV DPTR,#STAT_OU


4139 12 41 41 CALL DELAY

413C 74 03 MOV A,#03H ;OPEN DOORS

413E F0 MOVX @DPTR,A



413F HERE:

413F 80 FE SJMP HERE

4141 DELAY:

4141 75 31 0A MOV COUNT1,#10 ; F O R 1 S E C O N D S

DELAY

4144 75 30 64 MOV COUNT,#100

4144 DL2:

4147 12 41 51 CALL DELAY 1 MS

4147 D2:

414A D5 30 FA DJNZ COUNT,D2

414D D5 31 F4 DJNZ COUNT1,DL2

4150 22 RET

4151 DELAY 1 MS:

4151 75 8A 17 MOV T10,#017H ;TL0=17H, THE LOW

BYTE

;OF TIMER0

4154 75 8C FC MOV TH0,#0FCH ;TH0=FCH, THE HIGH

BYTE

;OF TIMER0

4157 12 41 5B CALL T0DELAY ; A C T I V A T E T H E

TIMER0, AND

;WAIT UPTO

415A 22 RET ;TIMER OVERFLOW

OCCURS.

415B T0DELAY:

415B E5 89 MOV A,TMOD

415D 54 F0 ANL A,#0F0H

415F 44 01 ORL A,#T0_M1

4161 F5 89 MOV TMOD,A ;2 TIMER 0, MODE1

4163 D2 8C SETB TR0 ;1 START THE TIMER0

4165 30 8D FD JNB TF0,$ ;0FFFF-(16 BIT TIMER

;VALUE)+1

;MONITOR TIMER FLAG 0

4168 C2 8C CLR TR0 ;1 STOP THE TIMER 0

416A C2 8D CLR TF0 ;1 CLEAR TIMER FLAG

0

416C 22 RET ;1 RETURN FROM

SUBROUTINE

END



EXAMPLE-2:

PROGRAM TO FIND THE NEAREST LIFT FOR A REQUEST FROM ANY FLOOR

AND SERVICE THE REQUEST USING 8051.

AIM:

To find the nearest Lift for a request from any floor and service the request.

DISCUSSION:

* As per the previous discussion the lifts are to be initialised.

* The request will be given by the user by setting the thumbwheel switch and will be confirmed

by pressing the “ENTER” key.

* This will be sensed by the program by polling the port address “C8H”.

* By an algorithm find the nearest Lift to the requested floor.

* Now move the Lift to the requested floor and give a beep, by standard procedures, already

explained.

* Give 3 beeps in case of an error condition.

PROCEDURE:



iii) Now, set the required floor number in the thumbwheel switch and press the “ENTER” key

for confirmation.

iv) See that the nearest lift will move to the requested floor, and the Lift door will be opened with

a beep.



PROGRAM:

0001 T0_M1 EQU 01H

0030 COUNT EQU 30H

0031 COUNT1 EQU 31H





4100 ORG 4100H

4100 START:

4100 74 03 MOV A,#03H ;DEFAULT DOORS IS IN

4102 90 FF CC MOV DPTR,#STAT_OU ;OPEN CONDITION



4108 90 FF C0 MOV DPTR,#LIFT1 ;IN GND FLOOR



410E 90 FF C4 MOV DPTR,#LIFT2 ;IN 7TH FLOOR


4112 12 41 CD CALL DELAY

4115 CHECK:

4115 90 FF C8 MOV DPTR,#STAT_IN

4118 E0 MOVX A,@DPTR

4119 54 F0 ANL A,#0F0H

411B B4 E0 F7 CJNE A,#0E0H,CHECK ;CHECK FOR ENTER KEY

411E E0 MOVX A,@DPTR

411F 54 0F ANL A,#0FH

4121 FF MOV R7,A

4122 B4 0F 03 CJNE A,#0FH,ER_1 ;CHECK IF IS GND FLOOR

4125 02 41 AA LJMP ERROR

4128 ER_1

4128 EF MOV A,R7

4129 C3 CLR C

412A 94 08 SUBB A,#08H

412C 40 7C JC ERROR ;CHECK IF 8TH OR 9TH FLOOR

412E 60 7A JZ ERROR ;CHECK IF 7TH FLOOR

4130 EF MOV A,R7

4131 C3 CLR C

4132 94 0C SUBB A,#0CH

4134 40 3A JC L_B ;FIND THE NEAREST LIFT

4136 FLR_A:

4136 74 02 MOV A,#02H ;CLOSE THE DOOR





413C EF MOV A,R7

413D B4 0E 09 CJNE A,#0EH,FLR_B

4140 74 40 MOV A,#40H ;1ST FLOOR

4142 90 FF C0 MOV DPTR,#LIFT1


4146 02 41 BF LJMP STAT

4149 FLR_B:

4149 B4 0D 0F CJNE A,#0DH,FLR_C

414C 74 40 MOV A,#40H ;1ST FLOOR

414E 90 FF C0 MOV DPTR,#LIFT1


4152 12 41 CD LCALL DELAY

4155 74 20 MOV A,#20H ;2ND FLOOR



415B FLR_C:

415B 74 40 MOV A,#40H ;1ST FLOOR

415D 90 FF C0 MOV DPTR,#LIFT1



4164 74 20 MOV A,#20H ;2ND FLOOR



416A 74 10 MOV A,#10H ;3RD FLOOR

416C F0 MOVX @DPTR,A

416D 02 41 BF LJMP SAT

4170 L_B:


4172 90 FF CC


4176 EF MOV A,R7

4177 B4 09 09 CJNE A,#09H,FLR_E

417A 74 02 MOV A,#02H ;FLOOR 6 OF LIFT2

417C 90 FF CC MOV DPTR,#LIFT2

417F F0 MOVX @DPTR,A


4183 FLR_E:

4183 B4 0A 0F CJNE A,#0AH,FLR_D

4186 74 02 MOV A,#02H ;FOOR 6 OF LIFT2



418C 12 41 CD CALL DELAY

418F 74 04 MOV A,#04H ;FLOOR 5 OF LIFT2





4195 FLR_D:

4195 74 02 MOV A,#02H ;FLOOR 6 OF LIFT2


419A F0 MOVX @DPTR,A

419B 12 41 CD CALL DELAY

419E 74 04 MOV A,#04H

41A0 F0 MOVX @DPTR,A

41A1 12 41 CD CALL DELAY

41A4 74 08 MOV A,#08H ;FLOOR 4 OF LIFT2


41A7 02 41 BF LJMP STAT

41AA ERROR:

41AA 78 03 MOV R0,#03H

41AC ERR:

41AC 74 0B MOV A,#OBH ;GIVE THREE BEEP

SOUND

41AE 90 FF CC MOV DPTR,#STAT_OU ;INDICATES ERROR

CONDITION

41B1 F0 MOVX @DPTR,A

41B2 12 41 CD CALL DELAY

41B5 74 03 MOV A,#03H


41B8 12 41 CD CALL DELAY

41BB D8 EF DJNZ R0,ERR

41BF STAT:

41BF 74 0B MOV A,#0BH ;TO OPEN THE DOOR

OF LIFT1

41C1 90 FF CC MOV DPTR,#STAT_OU ;AND GIVE BEEP FOR

1SEC

41C4 F0 MOVX @DPTR,A

41C5 12 41 CD LCALL DELAY

41C8 74 03 MOV A,#03H

41CA F0 MOVX @DPTR,A

41CB STOP:

41CB 80 FE SJMP STOP

41CD DELAY:

41CD 75 31 0A MOV COUNT,#10 ; F O R 1 S E C O N D S

DELAY

41D0 75 30 64 MOV COUNT,#100

41D0 DL2:

41D3 12 41 DD CALL DELAY 1 MS

41D3 D2:

41D6 D5 30 FA DJNZ COUNT,D2

41D9 D5 31 F4 DJNZ COUNT1,DL2



41DC 22 RET

41DD DELAY 1 MS: ;1 MILLI SECOND

41DD 75 8C FC MOV T10,#017H ;TL0=17H, THE LOW

;BYTE OF TIMER0

41E0 75 8C FC MOV TH0,#0FCH ;TH0=FCH,THE HIGH

;BYTE OF TIMER0

41E3 12 41 E7 CALL T0DELAY ;ACTIVATE THE TIMER0,AND

;WAIT UPTO

41E6 22 RET ;TIMER OVERFLOW OCCURS

41E7 T0DELAY:

41E7 E5 89 MOV A,TMOD

41E9 54 F0 ANL A,#0F0H

41EB 44 01 ORL A,#T0_M1

41ED F5 89 MOV TMOD,A ;2 TIMER 0, MODE1

41EF D2 8C SETB TR0 ;1 START THE TIMER 0

41F1 30 8D FD JNB TF0,$ 0FFFF-(16 BIT TIMER

;VALUE)+1

;MONITOR TIMER FLAG0

41F4 C2 8C CLR TR0 ;1 STOP THE TIMER 0

41F6 C2 8D CLR TR0 ;1 CLEAR TIMER FLAG 0

41F8 22 RET ;1 RETURN FROM SUBROUTINE

END



EXAMPLE-3:

PROGRAM TO SERVICE A REQUEST FROM ANY FLOOR TO GO TO GROUND

FLOOR OR 7TH FLOOR USING 8051

AIM:

To service a request from any floor to go to ground floor or 7th floor.

DISCUSSION:

* As per the previous discussion the lifts are to be initialised.

* The request will be given by the user by setting the thumbwheel switch and will be confirmed

by pressing the “ENTER” key.

* This will be sensed by the program by polling the port address “C8H”.

* By an algorithm find the nearest Lift to the requested floor.

* Now move the Lift to the requested floor and give a beep, by standard procedures, already

explained

* Now polling the address “C8H” for an input from “UP” or “DOWN” key.

* Now move the Lift to 7th floor by standard procedure if “UP” key is pressed and to Ground

floor if “DOWN” key is pressed.

PROCEDURE:



iii) Now, set the required floor number in the thumbwheel switch and press the “ENTER” key

for confirmation.

iv) See that the nearest lift will move to the requested floor, and the Lift door will be opened with

a beep.



PROGRAM:

0001 T0_M1 EQU 01H

0030 COUNT EQU 30H

0031 COUNT1 EQU 31H





4100 ORG 4100H

4100 START:

4100 74 03 MOV A,#03H ;DEFAULT DOORS IS IN

4102 90 FF CC



4108 90 FF C0 MOV DPTR,#LIFT1 ;IN GND FLOOR



410E 90 FF C4 MOV DPTR,#LIFT1 ;IN 7TH FLOOR


4112 12 42 F6 CALL DELAY

4115 CHECK:



4119 54 F0 ANL A,#0F0H

411B B4 E0 F7 CJNE A,#0E0H,CHECK ;CHECK FOR ENTER KEY

411E E0 MOVX A,@DPTR

411F 54 0F ANL A,#0FH

4121 FF MOV R7,A

4122 B4 0F 03 CJNE A,#0FH,ER_1 ; C H E C K I F I S G N D

FLOOR

4125 ER1:

4125 02 42 E1 LJMP ERROR

4128 ER_1

4128 EF MOV A,R7

4129 C3 CLR C

412A 94 08 SUBB A,#08H

412C 40 F7 JC ER1 ;CHECK IF 8TH OR 9TH

FLOOR

412E 60 F5 JZ ER1 ;CHECK IF 7TH FLOOR

4130 EF MOV A,R7

4131 C3 CLR C

4132 94 0C SUBB A,#0CH

4134 40 03 JC LIFT_B ;FIND THE NEAREST

LIFT



4136 02 41 3C JMP FLR_A

4139 LIFT_B:

4139 02 42 12 LJMP L_B

413C FLR_A:

413C 74 02 MOV A,#02H ;CLOSE THE DOOR

413E 90 FF CC MOV DPTR,#STAT_OU


4142 EF MOV A,R7

4143 B4 0E 0A CJNE A,#0EH,FLR_B

4146 74 40 MOV A,#40H ;1ST FLOOR



414C FE MOV R6,A

414D 02 41 76 LJMP STAT

4150 FLR_B:

4150 B4 0D 10 CJNE A,#0DH,FLR_C

4153 74 40 MOV A,#40H ;1ST FLOOR

4155 90 FF CC MOV DPTR,#LIFT1


4159 12 42 F6 LCALL DELAY

415C 74 20 MOV A,#20H ;2ND FLOOR


415F FE MOV R6,A

4160 02 41 76 LJMP STAT

4163 FLR_C:

4163 74 40 MOV A,#40H ;1ST FLOOR


4168 F0 MOVX @DPTR


416C 74 20 MOV A,#20H ;2ND FLOOR


416F 12 42 F6 LCALL DELAY

4172 74 10 MOV A,#10H ;3RD FLOOR


4175 FE MOV R6,A

4176 STAT:

4176 74 0B MOV A,#0BH ;TO OPE THE DOOR OF

LIFT1

4178 90 FF CC MOV DPTR,#STAT_OU ;AND GIVE BEEP FOR

1SEC


417C 12 42 F6 LCALL DELAY

417F 74 03 MOV A,#03H


4182 REPT:





4186 54 F0 ANL A,#0F0H

4188 FF MOV R7,A

4189 C3 CLR C

418A 94 E0 SUBB A,#0E0H

418C 50 F4 JNC REPT

418E 74 02 MOV A,#02H



4194 EF MOV A,R7

4195 B4 D0 2E CJNE A,#0D0H,UP

4198 DOWN:


419B EE MOV A,R6

419C B4 10 03 CJNE A,#10H,DOWN_B

419F 02 41 AE JMP DWN_B

41A2 DOWN_B:

41A2 B4 20 03 CJNE A,#20H,DOWN_A

41A5 02 41 B4 JMP DWN_A

41A8 DOWN_A:

41A8 B4 40 18 CJNE A,#40H,ER2

41AB 02 41 BA JMP DWN_GN

41AE DWN_B:

41AE 74 20 MOV A,#20H


41B1 12 42 F6 CALL DELAY

41B4 DWN_A:

41B4 74 40 MOV A,#40H


41B7 12 42 F6 CALL DELAY

41BA DWN_GN:

41BA 74 80 MOV A,#80H

41BC F0 MOVX @DPTR,A

41BD 12 42 F6 CALL DELAY

41C0 02 42 D3 JMP STOP_S

41C3 ER2:

41C3 02 41 E1 LJMP ERROR

41C6 UP:

41C6 B4 40 FA CJNE A,#0B0H,ER2 ;CHECK FOR UP KEY

41C9 90 FF C0 MOV DPTR,#LIFT1

41CC EE MOV A,R6

41CD B4 40 03 CJNE A,#40H,UPP_B

41D0 02 41 DF JMP UP_B

41D3 UPP_B:



41D3 B4 20 03 CJNE A,#20H,UPP_C

41D6 02 41 E5 JMP UP_C

41D9 UPP_C:

41D9 B4 10 E7 CJNE A,#10H,ER2

41DC 02 41 EB JMP UP_D

41DF UP_B:

41DF 74 20 MOV A,#20H

41E1 F0 MOVX @DPTR,A

41E2 12 42 F6 CALL DELAY

41E5 UP_C:

41E7 F0 MOVX A,#10H


41EB UP_D:

41EB 74 08 MOV A,#08H

41ED F0 MOVX @DPTR,A

41EE 12 42 F6 CALL DELAY

41F1 74 04 MOV A,#04H ;UP_E

41F3 F0 MOVX @DPTR,A

41F4 12 42 F6 CALL DELAY

41F7 74 02 MOV A,#02H ;UP_F

41F9 F0 MOVX @DPTR,A

41FA 12 41 F6 CALL DELAY

41FD 74 01 MOV A,#01H ;UP_G

41FF F0 MOVX @DPTR,A


4203 74 0B MOV A,#0BH ;TO OPEN THE DOOR

OF LIFT1

4205 90 FF CC MOV DPTR,#STAT_OU ;AND GIVE BEEP FOR

1SEC



420C 74 03 MOV A,#03H


420F 02 42 F4 LJMP STOP

4212 L_B:




4218 EF MOV A,R7

4219 B4 09 0A CJNE A,#09H,FLR_E

421C 74 02 MOV A,#02H ;FLOOR 6 OF LIFT2



4222 FE MOV R6,A

4223 02 42 4C LJMP STAT_S



4226 FLR_E:

4226 B4 0A 10 CJNE A,#0AH,FLR_D




422F 12 42 F6 CALL DELAY



4235 FE MOV R6,A

4236 02 42 4C LJMP STAT_S

4239 FLR_D:




423F 12 42 F6 CALL DELAY

4242 74 04 MOV A,#04H



4248 74 08 MOV A,#08H ;FLOOR4 OF LIFT2

424A F0 MOVX @DPTR,A

424B FE MOV R6,A

424C STAT_S:

424C 74 0B MOV A,#0BH ;TO OPEN THE DOOR

OF LIFT1

424E 90 FF CC MOV DPTR,#STAT_OU ;AND GIVE BEEP FOR 1

SEC



4255 74 03 MOV A,#03H


4258 REPT_S:


425B E0 MOVX A,@DPTR

425C 54 F0 ANL A,#0F0H

425E FF MOV R7,A

425F C3 CLR C

4260 94 E0 SUBB A,#0E0H

4262 50 F4 JNC REPT_S

4264 74 01 MOV A,#01H



426A EF MOV A,R7

426B B4 D0 3A CJNE A,#0D0H,UP_S

426E DOWN_S:




4271 EE MOV A,R6

4272 B4 02 03 CJNE A,#02H,FLO_E

4275 02 42 81 JMP FL_E

4278 FLO_E:

4278 B4 04 03 CJNE A,#04H,FLO_D

427B 02 42 87 JMP FL_D

427E 02 42 8D JMP FL_C

427E FLO_D:

4281 FL_E:

4281 74 04 MOV A,#04H



4287 FL_D:

4287 74 08 MOV A,#08H


428A 12 42 F6 CALL DELAY

428D FL_C:

428D 74 10 MOV A,#10H

428F F0 MOVX @DPTR,A


4293 74 20 MOV A,#20H



4299 74 40 MOV A,#040H


429C 12 42 F6 CALL DELAY

429F 74 80 MOV A,#80H


42A2 12 42 F6 CALL DELAY

42A5 02 42 D3 JMP STOP_S

42A8 UP_S:

42A8 B4 B0 36 CJNE A,#0B0H,ERROR

42AB 90 FF C4 MOV DPTR,#LIFT2

42AE EE MOV A,R6

42AF B4 08 03 CJNE A,#08H,U_E

42B2 02 42 C1 JMP UO_E

42B5 U_E:

42B5 B4 04 03 CJNE A,#04H,U_F

42B8 02 42 C1 JMP UO_F

42BB U_F:

42BB B4 02 23 CJNE A,#02H,ERROR

42BE 02 42 CD JMP UO_G

42C1 UO_E:

42C1 74 04 MOV A,#04H




42C4 12 42 F6 CALL DELAY

42C7 UO_F:

42C7 74 02 MOV A,#02H


42CA 12 42 F6 CALL DELAY

42CD UO_G:

42CD 74 01 MOV A,#01H

42CF F0 MOVX @DPTR,A

42D0 12 42 F6 CALL DELAY

42D3 STOP_S:

42D3 74 0B MOV A,#0BH ;TO OPEN THE DOOR

OF LIFT1

42D5 90 FF CC MOV DPTR,#STAT_OU ;AND GIVE BEEP FOR 1

SEC

42D8 F0 MOVX @DPTR,A

42D9 12 42 F6 LCALL DELAY

42DC 74 03 MOV A,#03H

42DE F0 MOVX @DPTR,A

42DF 80 13 SJMP STOP

42E1 ERROR:

42E1 78 03 MOV R0,#03H

42E3 ERR:

42E3 74 0B MOV A,#0BH ; G I V E T H E B E E P

SOUND

42E5 90 FF CC MOV DPTR,#STAT_OU ;INDICATES ERROR

CONDITION

42E8 F0 MOVX @DPTR,A


42EC 74 03 MOV A,#03H

42EE F0 MOVX @DPTR,A

42EF 12 42 F6 CALL DELAY

42F2 D8 EF DJNZ R0,ERR

42F4 STOP:

42F4 80 FE SJMP STOP

42F6 DELAY:

42F6 75 31 0A MOV COUNT1,#10 ; F O R 1 S E C O N D S

DELAY

42F9 75 30 64 MOV COUNT,#100

42F9 DL2:

42FC 12 43 06 CALL DELAY1 MS

42FF D2:

4302 D5 30 FA DJNZ COUNT,D2

4305 D5 31 F4 DJNZ COUNT1,DL2

4306 DELAY1 MS: ;1MILLI SECOND

4306 75 8A 17 MOV T10,#017H ;TLO=17H, THE LOW



BYTE OF

;TIMER0

4309 75 8C FC MOV TH0,#0FCH ;TH0=FCH, THE HIGH BYTE OF

;TIMER0

430C 12 43 10 CALL T0DELAY ;ACTIVATE THE TIMER 0, AND WAIT

;UPTO

430F 22 RET

4310 T0DELAY:

4310 E5 89 MOV A,TMOD

4312 54 F0 ANL A,#0F0H

4314 44 01 ORL A,#T0_M1

4316 F5 89 MOV TMOD,A ;2 TIMER 0, MODE1

4318 D2 8C SETB TR0 ;1 START THE TIMER 0

431A 30 8D FD JNB TF0,$ ;0FFFF-(16 BIT TIMER

;VALUE)+1

;MONITOR TIMER FLAG 0

431D C2 8C CLR TR0 ;1 STOP THE TIMER 0

431F C2 8D CLR TF0 ;1 CLEAR TIMER FLAG 0

4321 22 RET ;1 RETURN FROM SUBROUTINE

END



APPENDIX - A

CIRCUIT DIAGRAM

5 5

4 4

3 3

2 2

1 1

DD

CC

BB

AA

VC

CV

CC

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

VC

C

LFT1

-

RS

T-D0

D1

D2

D3

D4

D5

D6

D7

STA

TOU

T-

RS

T-D0

D1

D2

D3

D4

D5

D6

D7

LFT2

-

RS

T-D0

D1

D2

D3

D4

D5

D6

D7

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DC

40.

1MFD

DC

40.

1MFD

L7 LED

L7 LED

R3

330E

R3

330E

R12

330E

R12

330E

R6

330E

R6

330E

L19

LED

L19

LED

L16

LED

L16

LED

L3 LED

L3 LED

L12

LED

L12

LED

L6 LED

L6 LED

R17

330E

R17

330E

R9

330E

R9

330E

U6

74LS

273

U6

74LS

273

D1

3

D2

4

D3

7

D4

8

D5

13

D6

14

D7

17

D8

18

CLK

11

CLR

1

Q1

2

Q2

5

Q3

6

Q4

9

Q5

12

Q6

15

Q7

16

Q8

19

VC

C20

GN

D10

Q1

SL1

00Q

1S

L100

R13

330E

R13

330E

R2

330E

R2

330E

U5

74LS

273

U5

74LS

273

D1

3

D2

4

D3

7

D4

8

D5

13

D6

14

D7

17

D8

18

CLK

11

CLR

1

Q1

2

Q2

5

Q3

6

Q4

9

Q5

12

Q6

15

Q7

16

Q8

19

VC

C20

GN

D10

L2 LED

L2 LED

L13

LED

L13

LED

DC

60.

1MFD

DC

60.

1MFD

R1

330E

R1

330E

R5

330E

R5

330E

DC

50.

1MFD

DC

50.

1MFD

L9 LED

L9 LED

L14

LED

L14

LED

L5 LED

L5 LED

R14

330E

R14

330E

R4

330E

R4

330E

L10

LED

L10

LED

R24

330E

R24

330E

R8

330E

R8

330E

L17

LED

L17

LED

L4 LED

L4 LED

L21

LED

L21

LED

R10

330E

R10

330E

R18

330E

R18

330E

L8 LED

L8 LED

R15

330E

R15

330E

R25

220E

R25

220E

L18

LED

L18

LED

L15

LED

L15

LED

BU

ZZE

RB

UZZ

ER

12

L1 LED

L1 LED

U4

74LS

273

U4

74LS

273

D1

3

D2

4

D3

7

D4

8

D5

13

D6

14

D7

17

D8

18

CLK

11

CLR

1

Q1

2

Q2

5

Q3

6

Q4

9

Q5

12

Q6

15

Q7

16

Q8

19

VC

C20

GN

D10

R11

330E

R11

330E

L11

LED

L11

LED

R19

330E

R19

330E

R16

330E

R16

330E

R7

330E

R7

330E

5 5

4 4

3 3

2 2

1 1

DD

CC

BB

AA

VC

C

VC

C VC

C

VC

C

VC

CV

CC

VC

CV

CC

VC

C

SW

IN1-

D0

D2

D6

D1

D5

D4

D3

D7

RS

T 5.

5

RS

T 6.

5

RS

T 5.

5

Title

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

MO

DEL

: V

BMB-

022

2

ELEV

ATO

R IN

TER

FAC

E

Vi Mi

crosy

stems

Pvt.

Ltd.,

DR

N B

Y : M

rs.R

.V

CH

K B

Y : M

rs.R

.K

A

23

Thur

sday

, Dec

embe

r 01,

201

1

Title

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

MO

DEL

: V

BMB-

022

2

ELEV

ATO

R IN

TER

FAC

E

Vi Mi

crosy

stems

Pvt.

Ltd.,

DR

N B

Y : M

rs.R

.V

CH

K B

Y : M

rs.R

.K

A

23

Thur

sday

, Dec

embe

r 01,

201

1

Title

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

MO

DEL

: V

BMB-

022

2

ELEV

ATO

R IN

TER

FAC

E

Vi Mi

crosy

stems

Pvt.

Ltd.,

DR

N B

Y : M

rs.R

.V

CH

K B

Y : M

rs.R

.K

A

23

Thur

sday

, Dec

embe

r 01,

201

1

1 2 3 4 5 6

R27

3.3K

R27

3.3K

R20

3.3K

R20

3.3K

SW

5

TAC

TILE

SW

ITC

H

SW

5

TAC

TILE

SW

ITC

H

13

24

J1J11 2 3

4

DC

30.

1MFD

DC

30.

1MFD

R21

3.3K

R21

3.3K

L20

LED

L20

LED

SW

4

TAC

TILE

SW

ITC

H

SW

4

TAC

TILE

SW

ITC

H

13

24

R22 3.

3KR

22 3.3K

R26

3.3K

R26

3.3K

R23

3.3K

R23

3.3K

U3

74LS

244

U3

74LS

244

1A1

2

1A2

4

1A3

6

1A4

8

2A1

11

2A2

13

2A3

15

2A4

17

1G1

2G19

1Y1

18

1Y2

16

1Y3

14

1Y4

12

2Y1

9

2Y2

7

2Y3

5

2Y4

3

VC

C20

GN

D10

SW

2S

W2

4561 2 3

SW

1

THU

MB

WH

EE

L S

WIT

CH

SW

1

THU

MB

WH

EE

L S

WIT

CH

1 2 4 C B C

R29

330E

R29

330E

R28

3.3K

R28

3.3K

U1C

7400

U1C

7400

9 108

SW

3

LIM

IT S

WIT

CH

SW

3

LIM

IT S

WIT

CH

1 2 3

5 5

4 4

3 3

2 2

1 1

DD

CC

BB

AA

VC

C

+12V

VC

C

VC

C

VC

C

CM

OS

VC

C

+30V

-12V

VC

C

VC

CA

0A

1A

2A

3A

4A

5A

6A

7

A8

A9

A10

A11

A12

A13

A14

A15

ALE

RS

T

D0

D1

D2

D3

D4

D5

D6

D7

RS

T-IO

R-

IOW

-P

CLK

MW

-M

R-

INTA

-IN

TRR

ST

7.5

RS

T 6.

5R

ST

5.5

A5

IOW

-

IOR

-

LFT1

-

SW

IN1-

STA

TOU

T-A

4A

3A

2

A6

A7

LFT2

-

Title

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

MO

DEL

: V

BMB-

022

2

ELEV

ATO

R IN

TER

FAC

E

Vi Mi

crosy

stems

Pvt.

Ltd.,

DR

N B

Y : M

rs.R

.V

CH

K B

Y : M

rs.R

.K

A

33

Thur

sday

, Dec

embe

r 01,

201

1

Title

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

MO

DEL

: V

BMB-

022

2

ELEV

ATO

R IN

TER

FAC

E

Vi Mi

crosy

stems

Pvt.

Ltd.,

DR

N B

Y : M

rs.R

.V

CH

K B

Y : M

rs.R

.K

A

33

Thur

sday

, Dec

embe

r 01,

201

1

Title

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

MO

DEL

: V

BMB-

022

2

ELEV

ATO

R IN

TER

FAC

E

Vi Mi

crosy

stems

Pvt.

Ltd.,

DR

N B

Y : M

rs.R

.V

CH

K B

Y : M

rs.R

.K

A

33

Thur

sday

, Dec

embe

r 01,

201

1

U1A

7400

U1A

7400

1 23

14 7

U2

74LS

138

U2

74LS

138

A1

B2

C3

Y015

Y114

Y213

Y312

Y411

Y510

Y69

Y77

VC

C16

GN

D8

G1

6

G2A

4G

2B5

DC

10.

1MFD

DC

10.

1MFD

U1B

7400

U1B

7400

4 56

DC

20.

1MFD

DC

20.

1MFD

P1

P1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50



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