ʾʹõԴ
LPTIM1_IN1   ----- PA8
LED1             ----- PB4


ʾḶ́
1ϵϵͳʱΪRCH48Systickʱӳʼ
2LED1GPIOʼLED1ʼ״̬Ϩ𣬳ʼLPTIM1_INţ
3ʼLPTIM1LPTIM1ʱΪڲʱӣRCLʱΪⲿʱӣ
4NVICʼʹLPTIM1NVICжϲжȼ
5ʹLPTIM1Զƥжϣ
6MCUStopģʽ
7ʱLPTIM1_IN1ؼ1000ԶƥжϣMCU
8MCUѺLED1200ms˸
