of password quantity is little, security, poor mechanical combination lock is inevitable
trend. With the continuous development of science and technology, people in daily life
the demand is higher and higher safety insurance device. To meet the requirements of
people on the use of the lock, increase its safety, use the password instead of the key
combination lock arises at the historic moment. Combination lock with high safety, low
cost, low power consumption, easy operation, remember password lock, etc.
Currently use electronic combination lock is mostly based on single chip microcomputer
technology, single chip microcomputer as the main device, the encoder and decoder for
software.
This system consists of 16 f877 microcontroller system (mainly minimum 16 f877
microcontroller system), 4 * 4 matrix keyboard, LCD1602 display and alarm system, etc,
and has set up four, modify user password, password, input prompt error alarm functions
(this design by the single chip microcomputer control LCD display, the password correctly
display the password ok! Wrong password shows wrong, both please reset! The user to
enter again after reset. By single-chip microcomputer control matrix keyboard contains 0-9
number keys and A - F function keys. Press the F key, then carries on the password reset
function). This system is low cost, function and practical.WM function to control its turn.
And this is so called navigating aptitudinally .
关键字
单片机——microcontroller 芯片——CMOS chip
16F877
一、PIC16F877系列单片机简介
PIC16F87X ( 含873P874P876P877) 是美国微芯(Microchip) 公司推出的高性
能单片机，除具有单片机的通用资源外，该系列单片机还采用哈佛总线结构、二
级指令流水线取指方式、精简指令集(RISC)和内部具有E2 PROM 数据存储器及
FLASH 结构的程序存储器、仅35 条单字节单周期指令、在系统串行编程技术和在
线调试技术。 因此采用该系列单片机的产品具有低本钱、低功耗、高速度、高
可靠性、体积小、性价比高等特点。 其芯片引脚图如图1 所示。 另外，它内部
的E2 PROM 数据存储器不仅具有掉电保护数据的功能，更重要的是它的读写操作
均是由单片机内部时序控制，即外部电路无法对其进行访问， 因而具有极高的
数据保密性，这使得PIC16F87X在加密性产品如智能IC 卡、密码锁、电子防盗系
统等方面有很广泛的应用。
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