WFREQUENCE.C 程序运行前将S3的第2和第4拨码开关拨到ON,用跳线将T0和P0.0短接，拨码开关S1打开任一方波信号通道(2000KHZ,1000KHZ,500KHZ,250KHZ)；T0作为外部计数器，T1作为定时器，T1定时在1ms范围内察看计数器T0所计的数。计算出被测信号的频率并显示在LCD上.　　-WFREQUENCE.C S3 before running the first 2 and 4 DIP switch to ON, with a short jumper to P0.0 T0 and then, turn on DIP switch S1 either wave signal channel (2000KHZ, 1000KHZ, 500KHZ, 250KHZ)　T0 as an external counter, T1 as a timer, T1 timer counter in the 1ms range View the total number of T0. Calculate the frequency of the measured signal and displays in the LCD.