我是个采鸟,刚开始用,有些低级问题没明白,还望高手指导一下:我用的是MC9S08DZ单片机,采用内部时钟,在设置PWM的周期时,我设置为100U(也就是10K的频率),提示周期太短,甚至设置到2000u时,也是短 +Hint: Initial period is possibly shorter than interrupt subroutine overhead in high speed mode. +Warning: Period is too short. The method SetDutyMS will return an error code only in High speed mode. 这是怎么回事啊?怎么解决?谢谢各位。