Communication Protocols: SPI, I2C, UART

The three workhorse serial buses for talking to peripherals and other boards — how each is wired and clocked, and when to reach for which.

Read

60 min

Practice MCQs

25

Interview QA

25

Edition

v3

Editorial status

Review pending

Relevant for

Embedded Systems Engineer

Scope: NXP UM10204 revision 7; CMSIS-Driver 6 SPI/I2C/USART interfaces; current Zephyr peripheral APIs reviewed 2026-09-04.