INTRODUCTION TO MICROPEOCESSOR
MICROCOMPUTER SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
EOM’
|
|
|
EOP’
|
|
|
IOR’
|
|
|
IOW’
|
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: -DMA stands for Direct Memory Access. It is designed by Intel to transfer data at the fastest rate. It allows the device to transfer the data directly to/from memory without any interference of the CPU.
Detailed explanation-3: -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.