PIC16F877A RB0引发外部中断的使用方法，学习PS/2接口键盘解码的方法

按下PS/2键盘按键后，将引发外部中断，进入中断后，对键盘数据线进行判断，以判断出是哪个按键

按下，并利用1602液晶，将该键显示出来。-PIC16F877A RB0 interrupt caused by the use of external methods, learning PS/2 keyboard interface method of decoding press PS/2 keyboard button, it will trigger an external interrupt, the interrupt after the keyboard data cable for judgment to determine which button press Next, and using 1602, the key is displayed.