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关于28335EPWM的TBPRD的问题

老师您好!我要计算TBPRD的值。工作模式为增减模式。计数器的基准时钟TBCLK=150MKz,期望PWM频率为10K。根据:Fpwm=1/Tpwm得Tpwm=0.0001S。根据Tpwm=2*TBPRD*Ttbclk。得TBPRD=7500.可是当设置为这个值时,得到的频率竟然是2.5KHz,这是为什么?我哪里计算错了。请指教!~