Repaso Examen I

INEL 4206Repaso Examen I

© 2014 by M. Jiménez, R. Palomera, & I. Couvertier

INTRODUCTION TO EMBEDDED SYSTEMS: Using Microcontrollers and the MSP430 Chapter 1



Also see Choosing a MCU for your next design; 8 bit or 32 bit? (Atmel)

https://docs.google.com/viewer?url=http%3A%2F%2Fwww.atmel.com%2Fimages%2F45107a-choosing-a-mcu-fredriksen_article_103114.pdf





• Binary, hexadecimal, octal, fractions

• Conversion between bases and between bases and decimal

• Addition in binary and 2’s complement

• Binary Coded Decimal (BCD)

• Half-precision floating-point

• Basic terms (byte, word, nibble), ASCII, etc.

Chapter 2: Number Systems



Chapter 3: Architecture



MCUs are more application oriented than MPUs



● Hardware Components ● Arithmetic Logic Unit

(ALU) ● Control Unit (CU) ● FSM ● Fetch, decode,

execute ● Set of Registers ● Bus Interface Logic

(BIL)

● Software Components ● Instruction Set ● Addressing Modes



● Fetch State: ● PC = address of instruction ● instruction is read ● address -> address bus ● instruction -> data bus ● stored in the instruction register (IR).

● Decoding State: ● instruction meaning is deciphered. ● signals are sent to the appropriate CPU components to execute the

actions specified by the instruction ● Execution State: ● the actions specified by the instruction are carried out ● PC has been incremented to point to the address of the next

instruction in memory.

Fig. 3.4 States in control unit operation: fetch, decode, and execute



● Arithmetic operations (ADD, SUBTRACT, COMPLEMENT)

● Logic operations (AND, OR, NOT, XOR) ● SHIFT and ROTATE

ALU

REGISTERS● General purpose (GPR) ● Instruction register (IR) ● Program counter = instruction pointer ● Stack pointer ● Status register



REGISTERS● R4-R15 ● General purpose

● R0 = PC ● = Program counter

● SP = Stack pointer ● SR = Status register



● Individual bits indicate ALU operation result satisfies a particular condition ● Z = Zero bit or flag ● C = Carry bit ● N = Negative or Sign bit ● V = Overflow bit ● GIE = general interrupt flag ● indicates if interrupts are enabled











● A = B = 1 (both chips are disabled) if any of A15,A14,A13,A12,A11,A10,A9’,A8 are 1

● So for A = B = 0 => A15=A14=A13=A12=A11=A10=A9’=A8=0 ● A = B = 0 if Y=0, A0=0 and W/B’=1 ● A=0, B=1 if Y=0, A0=1 and W/B’=0 ● A=1, B=0 if Y=0, A0=0 and W/B’=0





MSP430 Assembly Language

https://www.ti.com/sc/docs/products/micro/msp430/userguid/as_5.pdf



Repaso Examen I

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