单片机开发液晶显示万年历计算器电子琴电子音乐字母输入-Developed single-chip liquid crystal display electronic organ electronic music calendar calculator input letters

AT89S52单片机，使用C编写的计算器程序。4*4按键扫描，SEG7段数码管显示，计算器，音乐播放器-AT89S52 microcontroller, using a calculator written in c programs. 4*4 press scan, SEG7 the digital display, calculator, music player