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Microprocessor

Microprocessor
Identify the communication interfacing device from the following

 8251
 8255
 8257
 8155

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Microprocessor
A microcomputer consists of

All of these
 memory
 a microprocessor
 I/O device

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Microprocessor
S0 and S1 pins are used for

None of these
 acknowledging the interrupt
 indicating the processor’s status
 serial communication

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Microprocessor
Which one of the following statement is false?

 A microprocessor has bi-directional data bus
 A microprocessor has an ALU
 A microprocessor has bi-directional address bus
 A microprocessor has unidirectional address bus

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Microprocessor
_____________is used to read the status of the hardware interrupts (RST 7.5, RST 6.5, RST 5.5) by loading into the A register a byte which defines the condition of the mask bits for the interrupts.

 EI
 SIM
 DI
 RIM

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Microprocessor
Length of the instruction POP D is

 4 byte
 1 byte
 3 byte
 2 byte

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