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代码说明：

  单片机完成两个功能：电机测速与频率测量，电机测速部分：单片机输出脉宽可调的方波控制电机速度，同时数码管显示电机的速度值。频率计部分：单片机完成对外部信号频率的测量，测量范围从2hz到10mhz，并通过数码管显示频率值。(MCU to complete two functions: motor speed and frequency measurement, the motor speed parts: the microcontroller output square wave pulse width adjustable motor speed control, digital display while the motor speed value. Frequency counter parts: MCU to complete the external signal frequency measurement, measuring range from 2hz to 10mhz, and through the digital display frequency.)

文件列表：

直流电机和频率计
................\BANK3_DISP.DSN,126769,2010-11-01
................\MyDesign1【修改】.ddb,4714496,2010-11-12
................\直流电机频率计综合程序.c,12789,2010-11-12
................\综合设计程序通用框架.c,5234,2010-09-19