When using STM8S003, due to insufficient pins, PB4 and PB5 were used as ordinary IO ports. As a result, no matter how the program was adjusted, a high level could not be output. I searched a lot of information on the Internet and finally figured out the problem after practice.
First of all, PB4 and PB5 can be used as I2C multiplexing ports, as described in the manual:
It can be found that the definition of the port property after PB4 and PB5 is T, which means true open-drain mode. There is neither P-Buffer nor protection diode connected to VDD inside. That is to say, no matter how it is set in the program, PB4 and PB5 can only be in open-drain mode. After clarifying this, if you need to use PB4 and PB5 as ordinary IO ports, it is recommended to add pull-up resistors so that high and low levels can be output normally.
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