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All the functions of the ports of 8255 are achieved by programming the bits of an internal register called

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All the functions of the ports of 8255 are achieved by programming the bits of an internal register called

(a) data bus control

(b) read logic control

(c) control word register

(d) none of the mentioned

I have been asked this question in examination.

This intriguing question originated from PIO 8255 (Programmable Input in section Basic Peripherals and their Interfacing with 8086/88 of Microprocessor

1 Answer

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by (49.2k points)
Right answer is (c) control word register

The explanation is: By programming the bits of control word register, the operations of the ports are specified.

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