程序如下：
void InitEPWM3(void)
{
EPwm1Regs.TBPRD= 1200; // Period = 1201 TBCLKcounts
EPwm1Regs.TBPHS.half.TBPHS = 0; // Set Phaseregister to zero
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Asymmetrical mode
EPwm1Regs.TBCTL.bit.PHSEN= TB_DISABLE; // Phaseloading disabled
EPwm1Regs.TBCTL.bit.PRDLD= TB_SHADOW;
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE;
EPwm1Regs.TBCTL .bit .HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm1Regs.TBCTL .bit .CLKDIV = TB_DIV1;
EPwm1Regs.CMPCTL.bit.SHDWAMODE= CC_SHADOW;
EPwm1Regs.CMPCTL.bit.SHDWBMODE= CC_SHADOW;
EPwm1Regs.CMPCTL.bit.LOADAMODE= CC_CTR_ZERO; // load on CTR=Zero
EPwm1Regs.CMPCTL.bit.LOADBMODE= CC_CTR_ZERO; // load on CTR=Zero
EPwm1Regs.AQCTLA.bit.PRD = AQ_CLEAR;
EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;
}
求大神指点
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