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In 8257 register format, the selected channel is disabled after the terminal count condition is reached when

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In 8257 register format, the selected channel is disabled after the terminal count condition is reached when

(a) Auto load is set

(b) Auto load is reset

(c) TC STOP bit is reset

(d) TC STOP bit is set

The question was posed to me during an interview.

My question is taken from DMA Controller 8257 topic in portion DMA, Floppy Disk and CRT Controllers of Microprocessor

1 Answer

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by (49.2k points)
Correct answer is (d) TC STOP bit is set

Explanation: If the TC STOP bit is set, the selected channel is disabled after the terminal count condition is reached, and it further prevents any DMA cycle on the channel.

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