ʾʹõԴ
LED1       ------ PB14
I2C_SCL    ------ PB8
I2C_SDA    ------ PB9

ʾḶ́
1ϵͳʱԴΪPLLPLLƵ48MʼSYSTICK
2ʼLED1 GPIOLED1ʼ״̬Ϊ𣬳ʼI2C1GPIO
3I2C1ĹʱΪRCH16MʼΪģʽģʽʱӳ͹ĻѹܣʼNVICжԴʹַܵƥжϣ
4MCUStopģʽǰRCHƵϵΪ2ƵȻSTOPģʽ
6ַƥMCUжϷ򣬵LED1

ע⣺
1I2Cַƥ份ѺϵͳʱԴΪRCHSYSRCHķƵϵΪ2Ƶ8M
