pwm问题

只看该作者 · 2011-11-8 14:54

PWMLO = 0x55;    //解锁
  PWMPL= LOBYTE(204);    //设置PWM周期Period = 204*(2/8.192us) = 50us
  PWMPH= HIBYTE(204);
  PWM1DL= LOBYTE(0);    //设置PWM占空比Duty = 0
  PWM1DH= HIBYTE(0);
  PWMDT0L=0;    //设置死区时间为1.2us = 10*(1/8.192us)
  PWMINT |= Bin(10001000); //使能PWM中断，首次开启PWM中断会马上产生中断
  tmp = PWMINT;
  PWMINT |= Bin(00000100); //PWM启动后，马上将PWMS位置一再清零,能够有效滤掉尖峰毛刺
  PWMEN |= Bin(00010010); //开启PWMP和PWMN输出
  PWMEN |= Bin(10000000); //开启PWMP和PWMN输出

无法开启PWMP和PWMN输出  PWMEN=0X12,手动改为PWMEN=0X92才可输出，就是PWMEN位写不了何解?