Giao tiếp 89C51 với LCD

Video Demo

Code

$MOD51

E BIT P3.2

RS BIT P3.1

RW BIT P3.0

ORG 00

MAIN:

LCALL SETUP

DONG2:

MOV DPTR,#DIS2

SETB E

CLR RS

CLR RW

MOV P1,#0C0H

CLR E

LCALL WAIT

LCALL XUAT_CHU 

DONG1:

MOV DPTR,#DIS1

DICH:

LCALL DISPLAY1

LCALL DELEY

LCALL DELEY

INC DPTR

MOV A,DPL

CJNE A,#LOW(DIS1+40),DICH

MOV A,DPH

CJNE A,#HIGH(DIS1+40),DICH

SJMP DONG1

SETUP:

SETB E

CLR RS

CLR RW

MOV P1,#38H ;cai dat ban dau

CLR E

LCALL WAIT

SETB E

CLR RS

CLR RW

MOV P1,#0CH 

CLR E

LCALL WAIT

SETB E

CLR RS

CLR RW

MOV P1,#06H

CLR E

LCALL WAIT

RET

DISPLAY1:

SETB E

CLR RS

CLR RW

MOV P1,#80H

CLR E

LCALL WAIT

XUAT_CHU:

MOV R1,#0

LOOP:

MOV A,R1

MOVC A,@A+DPTR

SETB E

SETB RS

CLR RW

MOV P1,A

CLR E

LCALL WAIT

INC R1

CJNE R1,#20,LOOP 

RET

WAIT: ;thoi gian doi 1ms

MOV TMOD,#10H

MOV TH1,#HIGH(-1000)

MOV TL1,#LOW(-1000)

CLR TF1

SETB TR1

JNB TF1,$

CLR TR1

CLR TF1

RET

DELEY: ;thoi gian de lay 1s

MOV R0,#100

CONT:

MOV TMOD,#10H

MOV TH1,#HIGH(-10000)

MOV TL1,#LOW(-10000)

CLR TF1

SETB TR1

JNB TF1,$

CLR TR1

CLR TF1

DJNZ R0,CONT

RET

ORG 100H

DIS1:

DB 'DEMO GIAO TIEP 8051-LCD '

ORG 200H

DIS2:

DB 'BY:CHIPKOOL.TK'

END

Phạm Văn Ngọc Anh- 01644326695

Phạm Minh Nhật       - 01649679474 

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