msp430的测频和测幅程序完整版，可直接测量电压值及频率。但测量电压不可超过单片机的管脚电压，可外接电阻进行测量较大值电压-msp430 frequency measurement and test procedures complete web version can be directly measured voltage and frequency. However, the measured voltage must not exceed the microcontroller pin

可测1~100kHz方波频率，使用的是外部中断0和定时器一起完成(Measurable 1~100kHz square wave frequency)