STM32 GPIO Lecture 18 : GPIO Output data register and summary of various modes discussed

GPIO Output data register and summary of various modes discussed

 

GPIO Output data register
Figure. GPIO Output data register

 

GPIO Output data register is used to control the I/O state of the I/O pins.

Here only16-bits are used in this register. So, 16 to 31 are reserved, and the 0th-bit position will control the I/O pin 0. 

If you write one means corresponding I/O pin as high and if you write 0 means corresponding I/O pin as is low. 

So, these bits can be read and written by software. By taking various modes and Pull-up/Pull-down registers combinations below configuration obtained for a GPIO pin:

  • Input floating.
  • Input Pull-up/Pull-down.
  • Analog.
  • Open drain with Pull-up/Pull-down.
  • Push-pull with Pull-up/Pull-down.
  • Alternate function open drain with Pull-up/Pull-down.
  • Alternate function push-pull with Pull-up/Pull-down.

 

In the following article, let’s see Alternate functionality setting of GPIO pin with example.

 

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