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Q.

Which of the following is not true features of 8257?

A

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

B

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

C

Each channel can transfer data up to 64kb.

D

Each channel can be programmed independently.

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MCQ

1.

How many types of Interfacing?

A

2

B

3

C

4

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5

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2.

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

A

Display Entry

B

Display Scan

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Strobed Input

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Scanned Keyboard Mode

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3.

What is true about Encoded Mode?

A

the unit contains registers to store the keyboard, display modes

B

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

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

D

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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4.

The chip 74LS245 is

A

bidirectional buffer

B

8-bit input port

C

one that has 8 buffers

D

all of the mentioned

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5.

To avoid loading during read operation, the device used is

A

latch

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flipflop

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buffer

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tristate buffer

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