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STM32F103RCT6, TQFP64, FLASH: 256K, RAM: 48K. 5, the on-board CH340C chip as USB to TTL communication use, connected to the master chip serial port 1, but also as ISP burn-in use. 8, four keys: 1 reset key, 3 function keys; 2 LED lights: 1 power indicator, 1 connected to PA8 (factory burned second flashing light program).
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