Telephone in People's Daily life is more of a common electronic products, it has entered one of each of our family. This paper designed a microcontroller based LCD display system phone dialpad keys.
System uses AT89C51 as phone keyboard dial-up buttons show core parts, determinants as input circuit, 1602LCD keyboard as display circuit. Software mainly uses the simple and practical written in C language realization. This design has circuit is simple, convenient, direct display reads, simple operation and programming easy and cost advantages, and can be used for cheap general life and work, also can through the modification, improve the performance, increase function, so as to bring to the life of people more convenient.
AT89C51是一种带4K字节闪存可编程可擦除只读存储器(FPEROM—Flash Programmable and Erasable Read Only Memory)的低电压、高性能CMOS 8位微处理器,俗称单片机。AT89C2051是一种带2K字节闪存可编程可擦除只读存储器的单片机。单片机的可擦除只读存储器可以反复擦除1000次。该器件采用ATMEL高密度非易失存储器制造技术制造,与工业标准的MCS-51指令集和输出管脚相兼容。由于将多功能8位CPU和闪烁存储器组合在单个芯片中,ATMEL的AT89C51是一种高效微控制器,AT89C2051是它的一种精简版本。AT89C51单片