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Find the control word for PA= out, PB= in, PCL=out, PCH=out (Mode0)?

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+1 vote
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in Microcontroller by (14.6k points)
Find the control word for PA= out, PB= in, PCL=out, PCH=out (Mode0)?

(a) 0x02H

(b) 0x82H

(c) 0x83H

(d) 0x03H

This question was posed to me in semester exam.

This is a very interesting question from Interfacing with 8255 in section AVR Microcontroller of Microcontroller

1 Answer

0 votes
by (24.2k points)
The correct option is (b) 0x82H

To explain: The value that is being loaded in the control word is 10000010b for PB as an input port and all others as the output ports being operated in mode0. The hex equivalent of 10000010b → 0x82H.

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