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MCQ

The timer generates an interrupt, if the count value reaches to

00FFH

FF00H

0FFFH

FFFFH

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The external interrupt that has the lowest priority among the following is

TF0

TF1

IE1

NONE

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If the external interrupts are programmed edge sensitive, then they should remain high for atleast

0 machine cycle

2 machine cycles

1 machine cycle

3 machine cycles

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The interrupts, INT0(active low) and INT1(active low) are processed internally by flags

IE0 and IE1

IE0 and IF1

IF0 and IE1

IF0 and IF1

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In serial port interrupt, after the control is transferred to the interrupt service routine, the flag that is cleared is

RI and TI

None

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The step involved in POP operation is

decrement stack by 2 and store 8-bit content to address pointed to by SP

store 16-bit content to address pointed to by SP and decrement stack by 1

decrement stack by 1 and store content of top of stack to address pointed to by SP

store content of top of stack to address pointed to by SP and then decrement stack by 1

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Microprocessor Basics

Classification

Input Output interfacing

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Multiprocessor Configuration

Peripheral Interface

Register Set of 8051

Serial Communication Unit

Segmentation

Paging

Instruction Set of 8086 8088

Interrupt and Stack of 8051

8051 Instruction Set

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