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TMS320F28P650SH: SFO只会更新HRPWMCAL1REG的值

Minos
Prodigy 30 points
Part Number: TMS320F28P650SH

SFO只会更新HRPWMCAL1REG.HRMSTEP，开启AUTOCONV后，我发现EPWM6的CMPAHR并不会根据HRMSTEP进行正确的转换，当我人为地将HRPWMCAL1REG.HRMSTEP值赋值给HRPWMCAL2REG时，工作正常，请问是什么问题？