Exercise: Microprocessors

Questions for: Microprocessors

Assertion (A): An instruction cycle consists of fetch and execute cycles.

Reason (R): Fetch cycle has one machine cycle but execute cycle may have one or more machine cycles depending on length of instruction.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct R is wrong
D:
A is wrong R is correct
Answer: B
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Microprocessor 386SX is a 16/32 bit microprocessor. It has
A:
16 bit registers and 32 bit data bus
B:
16 bit registers and 16 bit data bus
C:
32 bit registers and 32 bit data bus
D:
32 bit register and 16 bit data bus
Answer: D
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In 8085 stack pointer is
A:
4 bit register
B:
8 bit register
C:
16 bit register
D:
32 bit register
Answer: C
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In a 3 byte instruction of 8085, the first, second and third byte respectively indicate
A:
operation code, low order byte of data/address and high order byte of data / address
B:
low order byte of data / address, high order byte of data / address and operation code
C:
high order byte of data / address, low order byte of data / address and operation code
D:
high order byte of data / address, operation code and low order byte of data / address
Answer: A
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In setting up 'for' loops in Pascal, the initial and final values of index may be
A:
integer constants
B:
Integer constants or integer variable names
C:
integer constants or integer variable names or integer expressions
D:
integer constants or real constants
Answer: C
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