TMS320F28027: COM口动作后Comp1Regs.COMPSTS.bit.COMPSTS不变,这是咋回事

Part Number: TMS320F28027

COM口动作后Comp1Regs.COMPSTS.bit.COMPSTS不变,这是咋回事,看手册是说模块时钟未使能该位就不会变,这个时钟指的哪个时钟?

void InitComp1()
{
EALLOW;
Comp1Regs.COMPCTL.bit.SYNCSEL = 1; //比较器的同步选择位,0异步传送,1同步传送
Comp1Regs.COMPCTL.bit.QUALSEL = 3; //比较器输出的同步限定周期
Comp1Regs.COMPCTL.bit.CMPINV = 0; //比较器反向选择位,0输出,1反向输出
Comp1Regs.COMPCTL.bit.COMPSOURCE = 0; //比较器反向输入源选择位,0与内部DAC相连,1与外部管脚相连
Comp1Regs.COMPCTL.bit.COMPDACEN = 1;
Comp1Regs.DACVAL.all = 800;
EDIS;
}

这是COM口配置,有哥们帮看看吗?