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F2803x的EPWM手册里2.2.3.3 Time-Base Counter Synchronization章节提到,它使用Time-Base Counter Synchronization Scheme 1:
Scheme 1 shown in Figure 7 applies to the 280x, 2801x, 2802x, and 2803x devices. Scheme 1 also applies to the 2804x devices when the ePWM pinout is configured for 280x compatible mode (GPAMCFG[EPWMMODE] = 0).
因此,必须是EPWM1同步2,2同步3,3同步4,4同步5,依此类推,上面Eric已经答复如何配置。