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F28335的每个ePWM模块有单独的启动位吗?

F28335的官方例程中,是启动所有的ePWM模块:

                                      EALLOW;
                                                SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; // Start all the timers synced
                                      EDIS;

         F28335的每个ePWM模块有单独的启动位吗?如果不想同时启动所有的ePWM,怎么办?寄存器中没有相关的定义,使能ePWM的时钟就算启动了ePWM吗?