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The data will not go from the port registers to the pin unless:

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in Microcontroller by (14.6k points)
The data will not go from the port registers to the pin unless:

(a) DDR register of that port is set to 0

(b) PORT register of that port is set to 1

(c) DDR register of that port is set to 1

(d) PORT register of that port is set to 0

This question was addressed to me in semester exam.

This intriguing question originated from I/O Port Programming and Addressing Modes in division AVR Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
The correct choice is (c) DDR register of that port is set to 1

The best I can explain: The data will not go from the port registers to the pin unless the DDR register of that port is set to 1 because by doing this we make that port an output port after which data can be taken from the PORT registers to the pin.

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