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Module 5: External Communication Interface

20242m

How many lines are used in the basic SPI communication?
(i) 5
(ii) 2
(iii) 4
(iv) 3

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Answer: (iv) 3 (basic; 4 with SS)

Explanation: Basic SPI uses 3 lines: MOSI, MISO, SCK. Full operation with slave select adds SS/CS as 4th line. Question lists options 5,2,4,3 - the "basic" textbook answer is 4 lines including SS, but many syllabi count 3 without SS. Among given, (iv) 3 corresponds to basic 3-wire, (iii) 4 with SS is also considered correct in many books. If counting SS, answer is 4. Here we note: MOSI+MISO+SCK+SS =4 lines; without SS =3. For this MCQ the expected answer is 4 (including SS) but the option order shows (iv) 3 as closest to three-wire. Choose 4 if strictly counting SS, otherwise 3.**

For marking: Accept 3 or 4; standard SPI = 4 lines (MOSI, MISO, SCLK, SS).

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