AJMP MAIN
ORG 0030H
MAIN: MOV DPTR,#TAB ;字码表初址赋值
MOV R1,#0FEH ;列控制码
MOV R3,#8 ;列数
MOV R4,#88 ;移动“ ”及“0~9”11个字符，共88列
CM: MOV R5,#10 ;每屏反复显示10次
MOV R3,#8 ;列数
C1: MOV R2,#0 ;取码指针
C8: MOV P3,#0FFH ;关显示
MOV A,R2 ;
MOVC A,@A+DPTR ;取当前列的显示字码的一个字节
MOV P0,A ;送1~8行控制口
INC R2
MOV A,R1
MOV P3,A ;送列控制码
ACALL D5MS ;显示5MS
RL A ;列控制码左移，显示下一列
MOV R1,A
DJNZ R3,C8 ;未显示8 列，继续
DJNZ R5,C1 ;未显示10次，继续
INC DPL ;一屏反复显示10次完，字码表初值加1
DJNZ R4,CM ;88列未移动完，继续
AJMP MAIN ;88列显示完，返回，重新从“ ”开始显示
D5MS: MOV R6,#10
MOV R7,#248
DJNZ R7,$
DJNZ R6,$-4
RET
TAB: DB 00H,00H,00H,00H,00H,00H,00H,00H ;
DB 00H,00H,00H,7EH,81H,81H,81H,7EH ;0
DB 00H,00H,00H,00H,00H,82H,0FFH,80H ;1
DB 00h,00h,00h,0C6H,0A1H,91H,89H,0C6H ;2
DB 00H,00H,00H,42H,81H,81H,99H,66H ;3
DB 00H,00H,00H,1FH,10H,0FFH,10H,10H ;4
DB 00H,00H,00H,4FH,89H,89H,89H,79H ;5
DB 00H,00H,00H,7EH,89H,89H,89H,72H ;6
DB 00H,00H,00H,01H,01H,0F9H,05H,03H ;7
DB 00H,00H,00H,76H,89H,89H,89H,76H ;8
DB 00H,00H,00H,4EH,91H,91H,91H,7EH ;9
END
程序的基本原理：P0口送1~8行扫描码，P3口送列控制码。显示完一列，列控制码左移，显示第2列。