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将EPwm1设置为UP计数，达到CMPA值时EPwm1A输出高电平，达到PRD时输出低电平，EPwm1B为其互补波。使用DEADBAND。CMPB用于在EPwm1A高电平快结束时产生SOC。
现在的问题是，在CCS4中调试时，执行EPwm1Regs.ETPS.bit.SOCACNT = 1无效，寄存器相应位并没有改变。(注：PWM波形正常）
SOCACNT 是只读位。
