12864液晶時鐘顯示程序
LCD 地址變量
;**************變量的定義*****************
RS???????????? BIT????? P2.0??????????? ;LCD數據/命令選擇端(H/L)
RW???????????? BIT????? P2.1????????? ;LCD讀/寫選擇端(H/L)
EP???????????? BIT????? P2.2??????????? ;LCD使能控制
PSB??????? EQU?P2.3
RST??????? EQU?P2.5
PRE??????????? BIT????? P1.4??????????? ;調整鍵(K1)
ADJ??????????? BIT????? P1.5??????????? ;調整鍵(K2)
COMDAT???????? EQU P0
LED??????? EQU P0.3

YEAR?????????? DATA????? 18H??????????? ;年,月,日變量
MONTH????????? DATA????? 19H
DATE?????????? DATA????? 1AH
WEEK?????????? DATA????? 1BH

HOUR?????????? DATA????? 1CH??????????? ;時,分,秒,百分之一秒變量
MIN??????????? DATA????? 1DH
SEC??????????? DATA????? 1EH
SEC100???????? DATA????? 1FH

STATE????????? DATA????? 23H

LEAP?????????? BIT????? STATE.1??????????? ;是否閏年標志1--閏年，0--平年

KEY_S????????? DATA????? 24H??????????? ;當前掃描鍵值
KEY_V????????? DATA????? 25H??????????? ;上次掃描鍵值

DIS_BUF_U0????? DATA????? 26H??????????? ;LCD第一排顯示緩沖區
DIS_BUF_U1????? DATA????? 27H
DIS_BUF_U2????? DATA????? 28H
DIS_BUF_U3????? DATA????? 29H
DIS_BUF_U4????? DATA????? 2AH
DIS_BUF_U5????? DATA????? 2BH
DIS_BUF_U6????? DATA????? 2CH
DIS_BUF_U7????? DATA????? 2DH
DIS_BUF_U8????? DATA????? 2EH
DIS_BUF_U9????? DATA????? 2FH
DIS_BUF_U10???? DATA????? 30H
DIS_BUF_U11???? DATA????? 31H
DIS_BUF_U12???? DATA????? 32H
DIS_BUF_U13???? DATA????? 33H
DIS_BUF_U14???? DATA????? 34H
DIS_BUF_U15???? DATA????? 35H

DIS_BUF_L0????? DATA????? 36H??????????? ;LCD第三排顯示緩沖區
DIS_BUF_L1????? DATA????? 37H
DIS_BUF_L2????? DATA????? 38H
DIS_BUF_L3????? DATA????? 39H
DIS_BUF_L4????? DATA????? 3AH
DIS_BUF_L5????? DATA????? 3BH
DIS_BUF_L6????? DATA????? 3CH
DIS_BUF_L7????? DATA????? 3DH
DIS_BUF_L8????? DATA????? 3EH
DIS_BUF_L9????? DATA????? 3FH
DIS_BUF_L10???? DATA????? 40H
DIS_BUF_L11???? DATA????? 41H
DIS_BUF_L12???? DATA????? 42H
DIS_BUF_L13???? DATA????? 43H
DIS_BUF_L14???? DATA????? 44H
DIS_BUF_L15???? DATA????? 45H

FLAG??????????? DATA????? 46H ;1-年，2-月，3-日，4-時，5-分，6-秒，7-退出調整。
DIS_H?????????? DATA????? 47H
DIS_M?????????? DATA????? 48H
DIS_S?????????? DATA????? 49H