【摘要】 为提高传统PWM(Pulse Width Modulation)、软件延时方式所产生的矩形单脉冲的精度,提出一种基于51单片机串口产生矩形单脉冲的方法。控制51单片机(MCU-51)的串行通信口工作于方式3(9位异步通信方式),对外发送特定的数码,利用串口通信中数据帧的特殊结构形成宽度可调的矩形单脉冲;设置定时器T2工作于波特率发生器模式,控制串口的波特率,改变每个数据位的时间宽度,实现多个脉冲宽度值。实验数据表明,该方法产生的矩形单脉冲的脉宽精度能达到硬件晶振精度。更多还原

【Abstract】 The method of rectangular single pulse based on serial port of MCU-51 is proposed to improve the precision of rectangular single pulse generated by traditional PWM( Pulse Width Modulation) and software delay. Control the MCU-51 serial communication port work in mode 3-nine asynchronous communication mode,send specific digital,use the special data framestructure of the serial communication to formadjustablerectangular single pulse; Set timer T2 in the baud rate generator mode,by controlling the serial port baud rate,to change the duration of each data bit and realize multiple pulse width values. The experimental data shows that the pulse width accuracy of the rectangular single pulse can achieve crystal accuracy.更多还原