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Q#1
Microprocessor
GATE EC 2004
MCQ
+2 marks
-0.66 marks
The 8255 Programmable Peripheral Interface is used as described below.
I. An A/D converter is interfaced to a microprocessor through an 8255. The conversion is initiated by a signal from the 8255 on port C. A signal on port C causes data to be stored into port A.
II. Two computers exchange data using a pair of 8255s. Port A works as a bi-directional data port supported by appropriate handshaking signals.
The appropriate modes of operation of the 8255 for I and II would be
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