基于PIC16F877A的方波信号发生器电路设计

Circuit Design of Square-wave Signal Generator Based on PIC16F877A

方波信号是数字电路中非常重要的信号源,其产生方法有很多途径。本设计是基于MPLAB IDE平台通过对方波信号发生器的电路分析,介绍了方波信号的产生原理和软件实现过程,并利用PIC单片机的定时器/计数器技术对PIC16F877A进行编程;通过对TMR0模块进行设置,使其分频比改变,产生8种不同频率的方波信号,同时改变初始值,产生任意频率的方波信号。

The square- wave signal is an extremely important source in the digital circuit, which could be produced in many ways. The design is based on the MPLAB - IDE platform,through the circuit analysis of square - wave signal generator,it introduces the production principle of square - wave signal and realizes procession of software. Using the timer / counter technol- ogy of PIC and programming to PIC16F877A, setting option on the TMR0 module and changing its frequency division ratio, it could produce eight different frequency square-wave signals, at the same time, changing the initial value, producing the free frequency square - wave signal.