80C51单片机定时误差的研究

随着80C51在工业上的广泛应用,对定时精度的要求也越来越高。但是由于指令周期考虑不全和硬件自身的原因易引起定时误差。从软硬件方面分析了误差原因,并针对误差不确定性的特点从指令执行周期、计数器初值、计数器当前值、适时开关中断的角度出发给出了纠正方法。

Research on Time Error of 80C51 MCU

With its widespread use in industry,the demand for time accuracy of 80C51 is increasingly strict.Because instruction period is not completely considered and the hardware is not perfect,it is easy to cause error.For the error is indefinite,this paper analyses the reasons cause the error from software and hardware aspects,and provides correction methods from these aspects:instruction operation period,original counter digit,present counter digit and interruption on and off on time.