本程序为用单片机制作的占空比均匀间隔可调PWM发生器。占空比可调间隔为0.1。即可取得占空比为0 ，10 ，20 ……90 到100 的PWM波。该波的频率固定为1KH（周期1000微秒）。TX-1C学习板上的操作键 S2----占空比加S3----占空比减-The procedure for the use of single-chip evenly spaced adjustable duty cycle PWM generator. Adjustable duty cycle interval of 0.1. To obtain the duty cycle is 0 , 10 , 20　...... 90　to 100　of the PWM wave. The wave frequency is fixed at 1KH (period 1000 microseconds). TX-1C learning operation key board S2---- duty plus S3---- duty reduction