51光电编码器实现，STC处理编码器的要求，同时编码根据PS/2协议，实现上下键以及确定键。-Optical encoder 51 to achieve, STC encoder processing requirements, as well as coding in accordance with PS/2 protocol, to achieve and to identify the key up and down keys.

PS/2协议程序以及PS/2键盘的示例。-PS/2 protocol, as well as PS/2 keyboard example