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Microprocessor

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

 XRI 0FH
 ORI 0FH
 CMA
 ANI 0FH

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Microprocessor
What is mean by ALU

 Arithmetic local unsigned
 Arithmetic logic unit
 Arithmetic logic upgrade
 Arithmetic logic unsigned

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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 facilitates the user storing 16-bit data temporarily
 It counts 16-bits at a time

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Microprocessor
How many machine cycles are required for execution of IN 30H instruction

 4
 6
 5
 3

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Microprocessor
Which one of the following instruction may be used to clear the accumulator content irrespective of its initial value?

 ORA A
 CLR A
 MOV A, 00H
 SUB A

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Microprocessor
After RESET 8255 will be in

 mode 0; all ports are input
 mode 0; all ports are output
 mode 2
 unchanged condition

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