8279可编程键盘显示的相关描述资料，有两个PDF，比较全

介绍详细的8279使用资料及注意事项，包括与单片机的使用及防抖电路-8279 introduced the use of detailed information and attention to matters, including the use of single-chip microcomputer and the Anti-shake circuitry

8237各个引脚的功能以及其应用 可以运用于课程设计-8237 different pin functions and their applications can be used in curriculum design