B. E./B. Tech. Degree examination, april/may 2011 Sixth Semester


What is the difference between the shift and rotate instructions



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EE2354 auque
6. What is the difference between the shift and rotate instructions
A rotate instruction is a closed loop instruction.that is,the data moved out atone end is put back in at the other end.the shift instruction loses the data that is moved out of the last bit locations.

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EE2354 – MICROPROCESSORS AND MICROCONTROLLER
7. List the four instructions which control the interrupt structure of the 8085
microprocessor?
DI(disable interrupts)
EI(enable interrupts)
RIM(read interrupt masks) SIM(set interrupt masks)
8. Mention the categories of instruction and give two ex for each category
The instructions of 8085 can be categorized into the following five
1. Data transfer MOV RD,RS,STA BIT
2. Arithmetic ADD R,DCR M.
3. Logical XRI 8- bit,RAR
4. Branching JNZ CALL bit
5. Machine control HLT,NOP
9. Explain LDA,STA AND DAA instructions
LDA copies the data byte into the accumulator from the memory location specified by the bit address.STA copies the data byte from the accumulator in the memory location specified by bit address.DAA changes the content of the accumulator from binary to bit
BCD digits.

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