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What is the value of the control register when RESET button is set to zero?

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in Microcontroller by (14.6k points)
What is the value of the control register when RESET button is set to zero?

(a) 0x00H

(b) 0xFFH

(c) 0x11H

(d) value remains the same

I had been asked this question by my college professor while I was bunking the class.

I'm obligated to ask this question of Interfacing with 8255 topic in chapter 8051 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
The correct choice is (d) value remains the same

Easy explanation: RESET is active-high signal input into the 8255 used to clear the control register. When RESET is activated (i.e. set to high), all ports are initialized as input mode. Hence the value of the control register remains the same as it is even when the RESET button is set to zero.

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