ME6702 MECHATRONICS Mr.P.SANTHOSH AP/Mech Page 1 PART – B (5 x 16 =80) 1. Explain with a help of neat diagram of Pin out details of 8085 microprocessor. Intel 8085 consists of 40 pins and signal can be classified as follow: Address Bus. Data Bus. Control and Status signals. Power supply and frequency signals. Externally initiated signals. Serial I/O ports. ADDRESS BUS The 8085 has eight signal lines, A15 – A8 : Unidirectional, known as ‘high order address’. DATA BUS AD7 – AD0: bidirectional and dual purpose (address and data placed once at a time). AD7 – AD0 also known as ‘low order addresses’. To execute an instruction, at early stage AD7 – AD0 uses as address bus and alternately as data bus for the next cycle. The method to be change from address bus to data bus known as ‘bus multiplexing’.
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ME6702 MECHATRONICS
Mr.P.SANTHOSH AP/Mech Page 1
PART – B (5 x 16 =80)
1. Explain with a help of neat diagram of Pin out details of 8085 microprocessor.
Intel 8085 consists of 40 pins and signal can be classified as follow:
Address Bus.
Data Bus.
Control and Status signals.
Power supply and frequency signals.
Externally initiated signals.
Serial I/O ports.
ADDRESS BUS
The 8085 has eight signal lines, A15 – A8 : Unidirectional, known as ‘high order
address’.
DATA BUS
AD7 – AD0: bidirectional and dual purpose (address and data placed once at a time).
AD7 – AD0 also known as ‘low order addresses’.
To execute an instruction, at early stage AD7 – AD0 uses as address bus and alternately
as data bus for the next cycle.
The method to be change from address bus to data bus known as ‘bus multiplexing’.
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CONTROL AND STATUS SIGNAL
ALE – This signal helps to capture the lower order address presented on the multiplexed
address/data bus.
The ALE (Address Latch Enable) signal enables the lower order address to be latched
externally.
RD – Read (active low). To indicate that the I/O or memory selected is to be read and
data are available on the bus.
WR – Write: Active low. This is to indicate that the data available on the bus are to be
written to memory or I/O ports.
IO/M – To differentiate I/O operation of memory operations.
‘0’ - indicates a memory operation.
‘1’-indicates an I/O operation.
IO/M combined with RD and WR to generate I/O and memory control signals.
S1 and S0: Status signals, similar to IO/M, can identify various operations as shown on
the following table :
S1 S2 Operations
0 0 HALT
0 1 WRITE
1 0 READ
1 1 FETCH
POWER SUPPLY AND FREQUENCY SIGNALS
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EXTERNALLY INITIATED SIGNALS
SERIAL I/O PORTS
SID (Input) – This is input signal is used to accept serial data bit by bit from the external
device.
SOD (Output) – This is an output signal which enables the transmission of serial data bit
by bit from the external device.
RESET SIGNALS
RESET IN: an active low input signal, Program Counter (PC) will be set to 0 and thus
MPU will reset.
RESET OUT: an output reset signal to indicate that the μp was reset (i.e. RESET IN=0).
It also used to reset external devices.
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2. Explain the architecture of 8085 with the required diagrams. Also write the salient
features of the same.
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3. Draw and explain about the 8085 timing diagram.
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4. (i) Write short notes on comparison between microprocessor & microcontroller.
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(ii) Classify and explain the Addressing modes of 8085.
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5. Draw and explain the architecture of 8051 microcontroller.
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6. Explain the classification of instruction set of the microprocessor 8085.
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7. Draw and explain the block diagram and operation of temperature controlling system
with a microprocessor.
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8. Draw and explain the block diagram and operation of Traffic light controller with a
microprocessor.
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9. Describe with neat diagram the stepper motor control using microprocessor.
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