本设计的核心部分为STC89C52单片机,结合矩阵键盘、继电器、复位电路和晶振电路、数码显示、蜂鸣器等来实现电子密码锁的功能。代码从矩阵键盘输进去之后并与存入E2PRROM的密码比较,如果两者一致，则能打开密码锁。如果密码不一致,导致开锁失败，并发出报警信号。软件部分使用了KeilC51环境功能强大,用ISP下载。省去了编程器,编写程序采用C语言,使用灵活 。与E2PROM[2]相关的特殊功能寄存器,适用于一些需经常改变数据的应用产品及需远距离改变设备参数的产品[3-6],即在保证保密性与可靠性的基础上，还节约了PCB电路板的面积，降低了成本和故障率,有很大的推广意义。-The core part of this design is the STC89C52 single-chip microcomputer, the matrix keyboard, relay, reset circuit and the resonance circuit, digital display, buzzer, etc. To realize the function of electronic combination lock.Keyboard input password compare with E2PRROM password, if the password is consistent, will have to open the lock.If the password is not consistent, and send out alarm signal.Powerful software part use KeilC51 environment, with the ISP download.Using C language programming, the use of flexible.System many functions within the slice, [2] and E2PROM chips was introduced related special function register, apply to some need often change data for application products and distance change equipment parameters of the products [3-6], is in guaranteeing the confidentiality and reliability on the basis of also save the area of the PCB, cost and failure rate is reduced a lot, have a lot of promoting significance.