The system software involves five main modules: initialization module, phase-changing module, current-regulating module, speed-regulating module and timer interrupt module.
软件分为五块：主程序中的初始化模块、换相子程序模块、电流调节、速度调节子程序模块，定时器中断程序模块。
It is also possible for an ill-behaved software program to use the timer-counter for another purpose and change the interrupt rate.
它也有可能是病态的软件程序，以用于其他目的，定时器，计数器和中断率的变化。
Based on the principle of UART, a software method has been presented for asynchronous communication by using interrupt program of timer, and has been implemented in an application project.
本文通过分析通用异步通信器件的工作原理，给出了一种利用单片机的定时器中断程序实现异步通信的方法，并在实际工程项目中得到了应用。
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