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

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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

The question was asked in an interview for job.

My enquiry is from Interfacing with 8255 in section 8051 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
Correct option is (b) 0x82H

For explanation I would say: 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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