3.asm

这是多功能51单片机开发板的大部分模块的实例程序

;多功能51单片机开发板
;点阵式LED简单图形显示技术

CNTA EQU 30H
COUNT EQU 31H

ORG 00H
LJMP START
ORG 0BH
LJMP T0X
ORG 30H
START: MOV CNTA,#00H
MOV COUNT,#00H
MOV TMOD,#01H
MOV TH0,#(65536-4000) / 256
MOV TL0,#(65536-4000) MOD 256
SETB TR0
SETB ET0
SETB EA
WT: JB P3.2,WT
MOV R6,#5
MOV R7,#248
D1: DJNZ R7,$
DJNZ R6,D1
JB P3.2,WT
INC COUNT
MOV A,COUNT
CJNE A,#03H,NEXT
MOV COUNT,#00H
NEXT: JNB P3.2,$
SJMP WT

T0X: NOP
MOV TH0,#(65536-4000) / 256
MOV TL0,#(65536-4000) MOD 256
MOV DPTR,#TAB
MOV A,CNTA
MOVC A,@A+DPTR
MOV P2,A
MOV DPTR,#GRAPH
MOV A,COUNT
MOV B,#8
MUL AB
ADD A,CNTA
MOVC A,@A+DPTR
MOV P0,A
INC CNTA
MOV A,CNTA
CJNE A,#8,NEX
MOV CNTA,#00H
NEX: RETI

TAB: DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FH
GRAPH: DB 12H,14H,3CH,48H,3CH,14H,12H,00H
DB 00H,00H,38H,44H,44H,44H,38H,00H
DB 30H,48H,44H,22H,44H,48H,30H,00H
END