freescale qg8 PWM控制，本程序是PWM模块的例程，所用资源为单片机内部TPM模块，所接器件为LED，LED的闪烁频率逐渐减小，直到熄灭，然后再次点亮。-freescale qg8 PWM control PWM module of this procedure is routine, the use of resources within the TPM module for the MCU, the access device is LED, LED flicker frequ