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请教CC253 Timer4的通道1不能产生PWM

 P1DIR|=(1<<0);
 P1SEL|=(1<<0);
 P2SEL|=0x10;
 PERCFG&=~(1<<4);
 
 T4CC0=38;
 T4CCTL0=0x14;
 T4CTL=0xE2;//未开启
  T4CTL|=0x10;//启动 

 

 

P1DIR|=(1<<1);
 P1SEL|=(1<<1);
 P2SEL|=0x10;
 PERCFG&=~(1<<4);
 
 T4CC1=38;
 T4CCTL1=0x14;
 T4CTL=0xE2;//未开启
  T4CTL|=0x10;//启动

为什么Timer4的通道0可以产生PWM,而同样的配置通道1不行啊。