INTRODUCTION TO MICROPEOCESSOR
MICROCOMPUTER SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It signals the 8237 DMA controller that the microprocessor has relinquished control of the address, data, and control buses.
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HOLD
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HLDA
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IOR’
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IOW’
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Explanation:
Detailed explanation-1: -The 8237 supplies memory & I/O with control signals and memory address information during the DMA transfer. It is actually a special-purpose microprocessor which transfer high-speed data between memory and I/O. 8237 is not a discrete component in modern microprocessor-based systems.
Detailed explanation-2: -Answer : DMA(Direct Memory Access):Using a DMA controller, the device requests the CPU to hold its data, address and control bus, so the device is free to transfer data directly to/from the memory. 8253/8254 Programmable Timer/Control. 8255 : Programmable Peripheral Interface.
There is 1 question to complete.