UART
Last edited 2026-11-08
A UART (universal asynchronous receiver-transmitter) is a serial communication peripheral found on almost every microcontroller, including STM32.
How it works
[Start bit, data bits, parity, stop bit, baud rate…]
One frame in the common 8N1 format (8 data bits, no parity, 1 stop bit). The line idles high.
The frame starts with a low start bit, then 8 data bits (LSB first), then a high stop bit.