Which interface generally uses two signal lines, SDA and SCL? (i) UART

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Module 3: Embedded Microcontrollers – PIC18F / Others

20262m

Which interface generally uses two signal lines, SDA and SCL?

(i) UART
(ii) USB
(iii) I2C
(iv) SPI

Worked SolutionAI Assisted

Answer: (iii) I2C

I2C uses only two lines: SDA (serial data) and SCL (serial clock), with addressing for multiple devices. SPI needs 4 lines and UART uses TX/RX.

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