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TMDSCNCD28388D: pwm周期时长问题

Part Number: TMDSCNCD28388D

您好我运行了ti官方提供的例程epwm_ex2_updown_aq。程序中将pwm的TBPRD设置成2000,计数模式为增减计数,也并没有对pwm的时钟分频,按道理说生成的pwm应该是20us的周期,但我在示波器中却显示周期有40us,想请教下是否有别的地方会影响到pwm的周期但我没考虑?