֤stopʱ䣬ҲǴ˯߻ѵʱ䡣
ʹ¹ܣ
  P30/RTC1HZ
  P70/KR0½ذжϹ
  P140/PCLBUZ0ϵͳʱӵ8Ƶ
  P72stopѺת
  
             |<------ʱ------->|
     ________
P70:         |____________________________________________
     ________________________________ ____________________
P72: ________________________________X____________________

ʱʾ۲P70½غP72תؼļΪʱ䡣

ע޸CNTLDֵԸı临ʱ䡣 

ʾȿֶEVBP70ѣҲ԰P30/RTC1HZP70/KR0ܽʵÿԶѡ