A method of frequency measurement based on HSI(High Speed Input) of 80C196 is proposed. It is discussed that voltage sampling frequency tracks signal frequency according to the reasult of frequency measurement.

• 提出了一种基于 80 C196单片机 HSI的频率测量方法 ,并依据测量的频率来改变电压的采样时间间隔 ,实现频率跟踪功能。