这个代码中，我们用用计数器0来作为一个信号捕捉的端口。当在P3.4端口采集到下降沿的时候，会在数码管上加1.（P1.0连接到P3.4)在程序代码中，我们给了P1.0端口，进行 一个赋值，让它电平交替变化。每变化一次，数码管的值就会加1。-In this code, we use counter 0 as a signal to capture the port. When the P3.4 port to capture the falling edge of time, will increase in the digital control 1. (P1.0 connected to P3.4) In the program code, we give the P1.0 port, an assignment, it Level alternately. Each change, the value of the digital tube will be increased by 1.