我仿照网上的程序写了一个用ICP测频率的程序，将测量结果显示在数码管上。但通过软件仿真发现，改变频率，数码管显示值没有变化，不知是怎么回事，请各位指教。-I follow the program online to write a program with the ICP measured frequency, the measurement results are displayed in the digital pipe. But through software simulation found that changing the frequency, digital display value does not change, I do not know how, please advise.