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CCS/UCD3138A: Question about RAMP

Part Number: UCD3138A

Tool/software: Code Composer Studio

The Ramp Module ramp up  of voltage. i set the register of FeCtrl0Regs.RAMPDACEND.bit.RAMP_DAC_VALUE = 500.  And use of the bit of FeCtrl0Regs.RAMPSTAT.bit.RAMP_COMP_INT_STATUS to see if ramp up complete. But i find that the value don't ramp up to 500, the bit of RAMP_COMP_INT_STATUS maybe set to 1. The event occur accidentally. Why?