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ccs中debug时候单步运行配置完pwm,并无波形输出,必须RESUME运行才行,这是什么原因

我用的ti的标准例程  Example_2803xEPwmDeadBand

如下图,在配置完pwm后增加while循环,如果单步执行的话,理论上配置完最口一个开启pwm同步时钟应该就有pwm输出了,实际上没有,

如果此时改成全速运行

resume 则就有pwm输出,请问有人知道原因吗,

感之不尽