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Microprocessor

Microprocessor
Which one of the following microprocessor is not an 8-bit microprocessor

 68000
 6502
 8085
 Z-80

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Microprocessor
While using a frequency counter for measuring frequency, two modes of measurement are possible: Period time Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4MHz, the crossover frequency is given by

 2 Khz.
 1Khz.
 8 Mhz.
 2 Mhz.

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Microprocessor
The program counter in a 8085 micro-processor is a 16-bit register, because

 It has to fetch two 8-bit data at a time
 There are 16 address lines
 It counts 16-bits at a time
 It facilitates the user storing 16-bit data temporarily

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Microprocessor
The first machine cycle of an instruction is always

 A fetch cycle
 A memory read cycle
 A memory write cycle
 An I/O read cycle

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Microprocessor
Using DeMorgan’s Theorem we can convert any AND-OR structure into

NOR-NAND
OR-NAND
NAND-NAND
NAND-NOR

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Microprocessor
XCHG instruction exchanges the content of H-L with ______ register pair.

 Stack Pointer
 B-C
 PSW
 D-E

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