Question

Which of the following registers are related to port P1?

(a) P1SEL

(b) P1DIR

(c) P1IES

(d) All of the mentioned

I had been asked this question in unit test.

Question is taken from Digital Inputs, Outputs and Delays in chapter MSP430 Microcontroller of Microcontroller

Answer 1

Correct answer is (d) All of the mentioned

To explain: All of the mentioned registers are related to Port1.

P1SEL → Port Select Port pins are often multiplexed with other peripheral module functions. P1SEL and P1SEL2 bit is used to select the pin function – I/O port or peripheral module function.

P1DIR → Direction register selects the direction of the corresponding I/O pin.

P1IES → Interrupt Edge Select.