ARTERY AT32F421 GPIO, User Manual

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AT32F421 GPIO user guide
2020.07.30 5 Rev.1.0.0
www.arterytek.com
GPIO features

48-pin package (largest) has 39 multi-function bidirectional I/O ports

All I/O ports can be mapped to 16 external interrupt vectors
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Almost all I/O ports are 5V tolerant (except for 4x OSC/OSC32 pins)
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All fast IIOs, control registers accessible with fAHB speed

The peripheral function of the I/O pin can be locked through a specific operation to avoid
unwanted writing to I/O registers

Each GPIO pin can be individually configured by software as output (push-pull or open-drain),
input (with or without pull-up or pull-down) or an alternate function peripheral port

Optional current sourcing/sinking strength

Port bit set/clear register (GPIOx_BSRE) and port bit clear register (GPIOx_BRE) provide bit
access ability for the GPIOx_OPTDT register