RS BIT P3.2
RW BIT P3.1
E BIT P3.0
DB0_DB7 DATA P2
;********程序開始********
ORG 00H
AJMP START
ORG 000BH
AJMP INSE
ORG 50H
;********主程序函數(shù)**********
START:MOV TMOD,#0
MOV TL0,#0
MOV TH0,#0
SETB EA
SETB ET0
SETB TR0
MOV R5,#50
MOV SP,#60H
ACALL INIT
MOV A,#0C3H ;;;寫入指令
ACALL C51 ;;;
MOV A,#42H ;;;寫入數(shù)據(jù)
ACALL C51DDR ;;;
LOOP: AJMP LOOP
;*********中斷服務(wù)程序**********
INSE: MOV TL0,#0
MOV TH0,#0
DJNZ R5,NO
MOV R5,#50
NO:RETI
;*********LCD初始設(shè)置程序********
INIT: MOV A,#38H
LCALL C51
MOV A,#0EH
LCALL C51
MOV A,#06H
LCALL C51
RET
;*********檢查忙碌子程序*********
DDW: PUSH ACC
DDW1:CLR RS
SETB RW
CLR E
SETB E
MOV A,DB0_DB7
CLR E
JB ACC.7,DDW1
POP ACC
ACALL DELAY
RET
;********寫入指令到LCD寄存器子程序****
C51:ACALL DDW
CLR E
CLR RS
CLR RW
SETB E
MOV DB0_DB7,ACC
CLR E
RET
;*******寫入數(shù)據(jù)到LCD寄存器子程序*****
C51DDR:ACALL DDW
CLR E
SETB RS
CLR RW
SETB E
MOV DB0_DB7,ACC
CLR E
RET
;*********延時(shí)子程序*********
DELAY:MOV R6,#5
D1: MOV R7,#248
DJNZ R7,$
DJNZ R6,D1
RET
END
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