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Digital Circuit and Microprocessor MCQs

Electronics Engineering Objective Questions

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288. The following signal is used when a peripheral device requests the microprocessor to have a DMA operation
A. lo/ M
B. READY
C. HOLD and HLDA
D. RD and WR
Discussion
289. PROGRAM COUNTER is used to
A. store address of the next instruction to be executed
B. store temporary data to be used in arithmetic operations
C. store the status of the microprocessor
D. none of these
Discussion
290. The synchronization between microprocessor and memory is done by
A. ALE signal
B. HOLD signal
C. READY signal
D. none of these
Discussion
291. XOR function can be realised by a minimum of
A. 2 NAND gates
B. 4 NAND gates
C. 5 NAND gates
D. none of these
Discussion
292. Intel 8080A and 8085A differ in
A. Number of address lines
B. Number of data lines
C. Instruction set
D. Number of Interrupts
Discussion
293. In 8085 Program Status Word consists of
A. accumulator contents
B. flags
C. both accumulator and flag
D. status bits
Discussion
294. In 8085, out of hardware interrupts given below, one particular interrupt is quite different from others. This interrupt is
A. RST 5.5
B. RST 6.5
C. RST 7.5
D. none of these
Discussion

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