INTRODUCTION TO MICROPEOCESSOR
MICROCOMPUTER SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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This is an 8279 pin configuration input that is directly connected to the IORC or RD signal from the system
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Read
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Reset
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Shift
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Write
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Explanation:
Detailed explanation-1: -Scanned Sensor Matrix : In this mode, a sensor array can be interfaced with 8279 using either encoded or decoded scans.
Detailed explanation-2: -CS(CHIP SELECT) When this pin is low MP will write data or control words into the 8279. A0-When it is high it indicates the transfer of a command or status info.
Detailed explanation-3: -The control signals WR (active low), RD (active low), CS (active low) and A0 are used for read/write to 8279. It has an interrupt request line IRQ, for interrupt driven data transfer with processor. The internal clock frequency of the 8279 is nominally 100 kHz.
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