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MCQ

The chip 74LS245 is

bidirectional buffer

8-bit input port

one that has 8 buffers

all of the mentioned

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DMA stands for?

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What is true about Encoded Mode?

the unit contains registers to store the keyboard, display modes

the counter internally decodes the least significant 2 bits and provides a decoded 1 out of 4 scan on SL0-SL3.

the processor is requested service only if any key is pressed, otherwise the CPU will continue with its main task.

the counter provides the binary count that is to be externally decoded to provide the scan lines for the keyboard and display.

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Which of the following is not true features of 8257?

It has three channels which can be used over three I/O devices.

Each channel has 16-bit address and 14-bit counter.

Each channel can transfer data up to 64kb.

Each channel can be programmed independently.

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MCQ

The chip 74LS245 is

bidirectional buffer

8-bit input port

one that has 8 buffers

all of the mentioned

Discussion

MCQ

Which mode allows 8/16 character multiplexed displays to be organized as dual 4-bit/single 8-bit display units?

Display Entry

Display Scan

Strobed Input

Scanned Keyboard Mode

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category More Microprocessor Topics

Microprocessor Basics

Classification

Input Output interfacing

Microcontroller

8085 Architecture

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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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