i set GPIOC Pin13 high but high voltage is 1.5v How can I fix this problem?
VCC = 3.3v
What are you driving with the pin? Is something conflicting with that?
Seem to recall it being in low power domain, so limited current compared to other pins.
I driving LE pin of Latch (74HC573)
I found the problem
After how many times to program Micro , Pin 13 go floats
To fix this, need to remove the RTC battery and reinstall it
I tested 100 times, there is no connection between the Vbat pin and the GPIOC 13
Why does this problem occur?
PC13 is in the low power domain, will be powered by battery in absence of VDD.
Review Reference Manual (RM0090) search on "PC13", several references in there, and discussion of AF vs GPIO settings, and resetting RTC/PWR domains.
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