4个LED灯的控制程序，简单易用，利用单片机51进行IO控制，4个LED灯的控制程序，简单易用，利用单片机51进行IO控制。-Control procedures of the four LED lights, easy to use, the microcontroller 51 IO control, the control program of the four LED lights, easy to use, the use of single-chip 51 IO control.

This document describes a number of enhancements to the Universal Test & Operations PHY Interface for ATM (UTOPIA) data path interface [1]. This document assumes familiarity with the Level 1 Utopia document [1], which specifies the following :

51开发板原理图，涵盖LED模块，4*4键盘模块，数码管显示模块，串口模块，放大模块。