APM32F4 Chip Reset and I/O Port State

Zli

Hello everyone,

I am working on a project with an APM32F4 microcontroller and I have a few questions regarding the state of the I/O ports after resetting the chip. I hope someone with experience in this area can help me out.

What is the state of the I/O port after resetting the APM32F4 chip?
Is there any additional information or advice you can provide when working with the APM32F4 chip with regard to reset and I/O port configuration?

Thank you in advance for your help and support!

GeehySemi

APM32F4x series I/O status during reset and just after reset will be configured as floating input mode, and in such case the pull-up/pulldown resistor is disabled in input mode. After reset, the JTAG pin is put in the input pull-up or pull-down mode, and the specific configuration is as follows:
PA15: JTDI in pull-up mode
PA14: JTCK in pull-down mode
PA13: JTMS in pull-up mode
PB4: JNTRST in pull-up mode
PB3: JTDO is put in floating mode