INTRODUCTION TO MICROPEOCESSOR
MICROCOMPUTER SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is an 8237 DMA controller bi-directional pin used during programming and during DMA read cycle.
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DB7-DB0
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DREQ3-DREQ0
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IOR’
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IOW’
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Explanation:
Detailed explanation-1: -Intel 8237 is a direct memory access (DMA) controller, a part of the MCS 85 microprocessor family. It enables data transfer between memory and the I/O with reduced load on the system’s main processor by providing the memory with control signals and memory address information during the DMA transfer.
Detailed explanation-2: -The 8237 DMA Controller 8237 is a four-channel device compatible with 8086/8088, adequate for small systems. 8237 is capable of DMA transfers at rates up to 1.6MB per second.
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