How STM32 Alternate Functions work

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PS After Hours
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STM32 microcontrollers are one of the most popular MCUs in the world. There are many reasons for that. The Input/Output flexibility is not one of them. All SMT32 microcontrollers have a limited IO matrix that allows general input-output pins to work only with selected peripherals. There is no easy swap of pin functions. Some pins can be only UARTs, some only SPI, and some work only with 1 or 2 timers. This is called Alternate Functions.

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Each pin in each input-output port can have only one assigned Alternate Function at a time and no Alternate Functions are available.
This is extremely important during the hardware planning phase, as it might be hard to change the originally created pin assignment.



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Tags:
arm cortex
stm32
stm32 alternate function
stm32 alternate function mapping