单片机IO口应用， P3.3口做输入口，外接一脉冲，每输入一个脉冲，P1口按十六进制加一。P1口做输出口，编写程序，使P1口接的8个发光二极管L0—L7按16进制加一的方式点亮发光二极管。-Microcontroller IO port applications, P3.3 port as input port, an external one pulse, a pulse for each input, P1 plus one port in hexadecimal. P1 port to do output, programming, so that P1 port connected to 8 LEDs L0-L7 of 16 hex plus one way light emitting diodes.