数字频率计设计(PCB图+电路图+源程序)-课程设计，频率计的硬件电路是用Protel绘图软件绘制而成，软件部分的单片机控制程序，是用汇编语言编写而成。由于本设计采用了模块化的设计方法，具有性能优良，精度高，可靠性好等特点，提高了测量频率的范围。-Digital Frequency Meter (PCB schematic diagram++ source code)- course design, frequency of the hardware circuit is drawn by using Protel mapping software, the software part of the microcontroller control program is written in assembly language. Since the design uses a modular design approach, with excellent performance, high precision, reliability and other characteristics, the measurement frequency range.