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在资料上看到28335上不同的PWM模块之间时间基准计数器同步有两种方法，一种通过软件强制同步，即SWFSYNC写1；还有一种是硬件上的，通过外部输入引脚，PWM的第一个同步输入来自外部引脚；请问这个外部引脚是哪个脚？需要怎么进行设置呀？
GPIO6和GPIO32可以复用为ePWM的的同步信号输入EPWMSYNCI，GPIO6还可以作为同步信号的输出EPWMSYNCO.
