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TMS320F28075: Ecap 模块同步

Part Number: TMS320F28075

请问ECAP使能同步信号输入,同步信号从哪里来,与PWM同步信号有什么关联

ECap1Regs.ECCTL2.bit.SYNCI_EN = 1; // 使能同步信号输入
ECap1Regs.ECCTL2.bit.SYNCO_SEL = 3; // 同步信号输出禁止