STM8S103 STM8S003
Although the PA1 pin can wake up the CPU with an external interrupt, the power consumption is too large, with a current of 300uA, and it is not suitable for battery power supply. Therefore, do not use the external interrupt of PA1 to wake up the CPU. PA2 can be used, so in the sample board, I short-circuit the two pins and set PA1 to float.
PB4 and PB5 are I2C pins, which are open circuit inside. If the LED is driven at low level, there will be leakage current in sleep mode, whether it is floating or pulled up. It is about 100UA. It is better to pull up a 1M resistor directly on the pin, rather than using LED as pull-up. Because of leakage current, if no pull-up resistor is added, its voltage is floating and the current increases. This problem has bothered me for a long time. I hate it!
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