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我在配置PWM3和7时，需要时基同步输入源为PWM1，在使用寄存器时 只有PWM7有 SyncSocRegs.SYNCSELECT.bit.EPWM7SYNCIN这个属性，我想问一下PWM3的时基同步输入源要怎么选择？
PWM3的同步输入只能从PWM2接受，把PWM2的同步输出寄存器TBCTL[SYNCOSEL]配置成EPWMxSYNCI就行
