Question

How do we set the SPI, to operate in the master mode 1?

(a) We set the MSTR bit, and make the CPOL= 1 and CPHA=0

(b) We set the MSTR bit, and make the CPOL= 0 and CPHA=1

(c) We reset the MSTR bit, and make the CPOL= 1 and CPHA=0

(d) We reset the MSTR bit, and make the CPOL= 0 and CPHA=1

The question was asked in unit test.

My doubt is from SPI Protocol topic in section AVR Microcontroller of Microcontroller

Answer 1

The correct answer is (b) We set the MSTR bit, and make the CPOL= 0 and CPHA=1

Explanation: In SPI, to make it work in the master mode, we make the MSTR bit is equal to 1 and for operating it in the mode 1 we make the CPOL=0 and CPHA=1.