8 modes of GPIO port configuration

Table of contents

 8 modes​

 Floating/Pull-up/Pull-down input​

Analog input

 Open drain/push-pull output

 Multiplexed open-drain push-pull output

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GPIO I/O port bit basic structure 

 8 modes

 Floating/pull-up/pull-down input

Analog input

 Configure the pin as an analog input when using the ADC

 Open drain/push-pull output

Generally used ascommunication protocoldriver

Open-drain output PMOS is invalid, NMOS is valid, high level has no driving ability, low level has driving ability

Push-pull output PMOS and NMOS are both valid. The high level is connected to VCC and the low level is connected to VSS.

 Multiplexed open-drain push-pull output

Controlled by on-chip peripherals

 You can check what mode is configured through the manual