Question

How many logic signals are there in SPI?

(a) 5 signals

(b) 6 signals

(c) 4 signals

(d) 7 signals

The question was posed to me in an online quiz.

My question is from SPI Protocol in division Internet Principles of IOT

Answer 1

Right option is (a) 5 signals

The best explanation: The SPI bus specifies five logic signals:

 SCLK: Serial clock(output from master)

 MOSI: Master Output Input, Master Out Slave In(data output from master)

 MISO: Master Input Slave Output, or master In Slave Out( data output from master)

 SDIO: Serial Data I/O(bidirectional I/O)

 SS: Slave Select(often active low, output from master).