I have a problem for use infrared interface (IRTIM) of my MCU. When I saw in Reference manual I could find this:
Now, when I search for find GPIOx_AFRx register, I cannot find this register in reference manual.
Where is it?
Configure GPIO pin for infrared interface (IRTIM) of STM32F030x4/x6/x8
gpioregisterstm32f0
Related Topic
- Electronic – Input circuit for GPIO of a 3.3v tolerant microcontroller
- Electronic – Use a single GPIO for Multiple Uses (TMS320F2803x MCU)
- Electrical – How does a CPU interface with GPIO pins
- Electronic – Eagle: Alternative to Pinswap for GPIO expander
- Electronic – MCU GPIO input pin state copying/buffering as another pin output in real-time
Best Answer
The actual register isn't named
GPIOx_AFRx, the "x" is a placeholder for other designators.In this case, the first "x" is a placeholder for a numbered general purpose I/O, and the second "x" is a placeholder to indicate the alternate function low or high register.
If you look at sections 8.4.9 and 8.4.10 (PDF page 128) of the document you linked, you'll find they deal with the
GPIOx_AFRLandGPIOx_AFRHfor the low and high registers, respectively.