RFQ/BOM 0 登錄 / 註冊

選擇您的位置

用戶形象

When the STM32F103RFT6 PC3 is used as an input, the PC3 mode is set to pull-up input. When the MCU reads out, the results are all high.

MCU
12月 10, 2020 by Margo 1688

Friends, would like to ask a question about the input port


Chip: STM32F103RFT6

PC3 used as input


Phenomenon 1:

When the PC3 mode is set as a pull-up input, regardless of whether the peripheral is 3.3V or 0V for this pin, the result read by the MCU is always high.

Phenomenon 2:

When the PC3 mode is set as a pull-down input, regardless of whether the peripheral is 3.3V or 0V for this pin, the result read by the MCU is always low.


What is the reason, please advise.

所有評論

user image

Yuri 發表於 December 10, 2020

That's not right, how did you give 0V to the peripheral circuit for the pull-up input? Ground? It's best to post the program and show it to you.

0
user image

Lars 發表於 December 10, 2020

Configuration problem.

0
user image

Janna 發表於 December 10, 2020

It is recommended that you use a 100 ohm resistor to connect this pin to ground under test.

0

寫一個答案

您需要登錄才能回覆。 登錄 | 註冊