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CCS/UCD3138A: Question about CMP

Part Number: UCD3138A

Tool/software: Code Composer Studio

The register of CMP setting by the code as follow:

FaultMuxRegs.ACOMPCTRL1.bit.ACOMP_C_THRESH = 30;

FaultMuxRegs.ACOMPCTRL1.bit.ACOMP_C_SEL = 0; 
FaultMuxRegs.ACOMPCTRL1.bit.ACOMP_C_POL = 0;

But i don't set the register bit of FaultMuxRegs.DPWM0FLTABDET.bit.ACOMP_C_EN. And i find the default value of ACOMP_C_EN is 0. but i find when the compare input blew the register of ACOMP_C_THRESH, the pwm output will be disable. why? i think the pwm output need to be disable when the bit of ACOMP_C_EN is 1.