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Microprocessor

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

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

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Microprocessor
The operations executed by two or more control units are referred as

 Macro-operations
 Multi-operations
 Bi control-operations
 Micro-operations

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Microprocessor
The relation among IC (Instruction Cycle), FC (Fetch cycle) and EC (Execute Cycle) is

 IC = FC + 2EC
 IC = FC - EC
 EC = IC + FC
 IC = FC + EC

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Microprocessor
The characteristics of RESET OUT signal is/are

 all.
 this signal can be used to reset other devices.
 the signal is synchronized to the processor clock.
 indicates that µp is being reset.

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Microprocessor
In microprocessor based system I/O ports are used to interface

 the O/P devices only
 the I/P device only
 the I/O devices and memory chips
 all the I/O devices

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Microprocessor
Identify the communication interfacing device from the following

 8257
 8251
 8255
 8155

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