键盘键输入并在LCD上显示键盘键编写并调试具有加1和减1功能的功能键的监控程序，并在LCD上显示数值的变化。左边四位或二位显示外部存储器或内部存储器地址，右边二位显示存储器中内容。-Keyboard keys and the keyboard keys displayed on the LCD write and debug a plus 1 and minus 1 function of the function keys control procedures, and changes the value displayed on the LCD. Four or two shows left external memory or internal memory address, the right two display memory contents.