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Features:
STM32F103ZET6
Main frequency 72M
512K ROM, 62K RAM
1 reset button, 1 user button
1 power indicator, 1 user LED
1 Type-C interface
8M master clock crystal
Onboard 32.768Khz RTC crystal
Lead the SWD and serial port through the pin header
Reserved RTC battery holder pad
108 free ones are all taken out
1 TF card interface