INTRODUCTION TO MICROPEOCESSOR
MICRO PROCESSOR AND MICRO CONTROLLER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Serial communication
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Parallel communication
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DMA controller
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Keyboard/Display controller
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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: -Computers that have DMA channel can transfer data to and from devices much more quickly than computers without DMA channel. The difference between 8237 and 8257 is that, 8237 provides better performance than 8257.
Detailed explanation-3: -Intel’s 8257 is a four channel DMA controller designed to be interfaced with their family of microprocessors. Each channel can be independently programmable to transfer up to 64kb of data by DMA. Each channel can be independently perform read transfer, write transfer and verify transfer.