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Microprocessor

Microprocessor
If m is a power of 2, the number of select lines required for an m-input mux is:

2*m
2^m
log2 (m)
m

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Microprocessor
During which T-state, contents of OP code from memory are loaded into IR (Instruction Register)?

 T2 OP code fetch
 T4 OP code fetch
 T3 OP code fetch
 T1 OP code fetch

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

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

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Microprocessor
In order to complement the lower nibble of accumulator one can use

 CMA
 ANI 0FH
 XRI 0FH
 ORI 0FH

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Microprocessor
The operating modes of 8255 A are called

Mode 0, mode 1 and mode 2
Mode 0 and mode 1
Mode 0, mode 2 and mode 3
Mode 0 and mode 2

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Microprocessor
In a C expression using assignment operators, relational operators and arithmetic operators, the hierarchy of operations (in the absence of parenthesis) is

Arithmetic, assignment, relational
Relational, assignment, arithmetic
Assignment, relational, arithmetic
Arithmetic, relational, assignment

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