[LT]:CODE LẬP TRÌNH 8051 CƠ BẢN ASM

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I.PHẦN LED ĐƠN LỆNH MOV

1.Chương trình led sáng nhấp nháy port 1.

ORG 00H
MAIN:
MOV P1,#00H;led tắt hết
CALL DELAY
MOV P1,#0FFH;led sáng hết
CALL DELAY
JMP MAIN
DELAY:;CT tạo trễ
MOV R0,#50
LAP:
NOP
NOP
DJNZ R0,LAP
RET
END

2.Chương trình Led sáng dần port 1

ORG 00H
MAIN:
MOV P1,#00000000B;Trạng thái led tắt hết
CALL DELAY
MOV P1,#00000001B;Led p1.0 sáng
CALL DELAY
MOV P1,#00000011B;led p1.0,p1.1 sáng
CALL DELAY
MOV P1,#00000111B;led p1.0,p1.1,p1.2 sáng
CALL DELAY
MOV P1,#00001111B
CALL DELAY
MOV P1,#00011111B
CALL DELAY
MOV P1,#00111111B
CALL DELAY
MOV P1,#01111111B
CALL DELAY
MOV P1,#11111111B
CALL DELAY
JMP MAIN
DELAY:
MOV R0,#200
LAP:
MOV R1,#200
LAP2:
NOP
NOP
NOP
DJNZ R1,LAP2
DJNZ R0,LAP
RET
END

3.Chương trình led tắt dần port 1

ORG 00H
MAIN:
MOV P1,#11111111B;Trạng thái led sáng hết
CALL DELAY
MOV P1,#11111110B;Led p1.0 tắt
CALL DELAY
MOV P1,#11111100B;led p1.0 tắt,p1.1 tắt
CALL DELAY
MOV P1,#11111000B
CALL DELAY
MOV P1,#11110000B
CALL DELAY
MOV P1,#11100000B
CALL DELAY
MOV P1,#11000000B
CALL DELAY
MOV P1,#10000000B
CALL DELAY
MOV P1,#00000000B
CALL DELAY
JMP MAIN
DELAY:
MOV R0,#200
LAP:
MOV R1,#200
LAP2:
NOP
NOP
NOP
DJNZ R1,LAP2
DJNZ R0,LAP
RET
END

4.Sáng dần tắt dần theo chiều ngược lại:

ORG 00H
 
MAIN:
CALL CON1
CALL CON2
JMP MAIN
CON1:;SANG DAN
MOV P1,#00000000B
CALL DELAY
MOV P1,#10000000B
CALL DELAY
MOV P1,#11000000B
CALL DELAY
MOV P1,#11100000B
CALL DELAY
MOV P1,#11110000B
CALL DELAY
MOV P1,#11111000B
CALL DELAY
MOV P1,#11111100B
CALL DELAY
MOV P1,#11111110B
CALL DELAY
MOV P1,#11111111B
CALL DELAY
RET
 
CON2:;TAT DAN
MOV P1,#11111111B
CALL DELAY
MOV P1,#01111111B
CALL DELAY
MOV P1,#00111111B
CALL DELAY
MOV P1,#00011111B
CALL DELAY
MOV P1,#00001111B
CALL DELAY
MOV P1,#00000111B
CALL DELAY
MOV P1,#00000011B
CALL DELAY
MOV P1,#00000001B
CALL DELAY
MOV P1,#00000000B
CALL DELAY
RET
 
DELAY:
MOV R0,#200
LAP:
MOV R1,#200
LAP2:
NOP
NOP
NOP
DJNZ R1,LAP2
DJNZ R0,LAP
RET
END

II. PHẦN LED ĐƠN LỆNH QUAY.

ORG 0000H
MAIN:; Bat dau chuong trinh chinh
CALL CTA;Goi chuong trinh con sang dan tu tren xuong duoi
CALL CTB;Goi chuong trinh con sang dan tu duoi len tren
JMP MAIN
;-----------chuong trinh con sang dan tu tren xuong duoi--------------------------
CTA:
MOV A,#00H;Thanh ghi A la 00000000
LAP:;Nhan cua vong lap
SETB C;Thit lap co nho C len 1
RLC A;Quay trai co C co nho
MOV P2,A;Dua gia tri vao P2
CALL DELAY;Tao thoi gian tre de thay hieu ung
CJNE A,#0FFH,LAP;Kiem tra neu chua bang 11111111 thi nhay den nhan LAP
RET
 
;-------------chuong trinh con sang dan tu duoi len tren-------------------------
CTB:
MOV A,#00H; dua gia tri 00000000 vao thanh ghi tich luy A
LAP1:            ; nhan vong lap
SETB C          ; Thiet lap co nho C len 1
RRC A            ; quay phai thanh ghi A co co nho
MOV P2,A    ; chuyen gia tri thanh ghi A vua quay xuat ra Port 2
CALL DELAY;goi chuong trinh tre de thay hieu ung led
CJNE A,#0FFH,LAP1;Kiem tra thanh ghi A da bang 11111111 chua, neu chua bang thin hay den LAP1
RET
;----Chuong trinh tao thoi gian tre-----
DELAY:
MOV R0,#200
LOOP:
MOV R1,#210
LOOP1:
NOP
DJNZ R1,LOOP1
DJNZ R0,LOOP
RET
END

III. LED ĐƠN LẪY BẢNG MÃ

 

ORG 00H
MAIN:
CALL CTA; sang dan qua trai
CALL CTB; sang dan qua phai   
JMP MAIN
;*****************************************
CTA:
    MOV R0,#00H        ;Bien dem so trang thai hien thi
    MOV DPTR,#MALED    ;Nap di chi vung du lieu
LABEL:               
    MOV A,R0            ; Chuyen gia tri thanh ghi R0 vao thanh ghi A
    MOVC A,@A+DPTR        ; Lay du lieu tu vung nho
    MOV P2,A            ;Hien thi
    CALL DELAY
    INC R0            ; Lay du lieu ke tiep
    CJNE R0,#9,LABEL        ; Kiem tra so du trang thai hien thi
RET
;*****************************************
CTB:
    MOV R0,#00H
    MOV DPTR,#MALED1
LABEL1:
    MOV A,R0
    MOVC A,@A+DPTR
    MOV P2,A
    CALL DELAY
    INC R0
    CJNE R0,#9,LABEL1
RET
;******************************************
MALED: DB 00H,01H,03H,07H,0FH,1FH,3FH,7FH,0FFH; co 9 ma led CTA
;00000000b,00000001b,00000011b,………
MALED1: DB 00H,80H,0C0H,0E0H,0F0H,0F8H,0FCH,0FEH,0FFH; 9 ma led CTB
;----Chuong trinh tao thoi gian tre-----
DELAY:
MOV R3,#200
LOOP:
MOV R2,#250
LOOP1:
NOP
DJNZ R2,LOOP1
DJNZ R3,LOOP
RET
END

 

IV. DÙNG IC 74HC595

 

ORG 00H
MAIN:
CALL CTA;goi chuong trinh con
CALL CTB
CALL CTC
JMP MAIN
 
CTA:
;sang dan led
MOV R1,#8;quet 8 led
LAP:
SETB P2.0;thiet lap bit chan data len 1 cho led sang
CALL DELAY
SETB P2.1;tao xung mo cho bit vao chan SH
CALL DELAY
CLR  P2.1;tao xung dong khong cho bit vao chan SH
CALL DELAY
SETB P2.2;tao xung mo ST cho bit xuat ra cac chan led
CALL DELAY
CLR  P2.2;tao xung dong ST khong cho bit xuat ra cac chan led
CALL DELAY
DJNZ R1,LAP
 
;tat dan led
MOV R1,#8
LAP1:
CLR P2.0;thiet lap bit chan data len 1 cho led sang
CALL DELAY
SETB P2.1
CALL DELAY
CLR  P2.1
CALL DELAY
SETB P2.2
CALL DELAY
CLR  P2.2
CALL DELAY
DJNZ R1,LAP1
RET
 
CTB:;sang 1 led chay
MOV R4,#3
NHAY:
SETB P2.0
CALL DELAY
SETB P2.1
CALL DELAY
CLR P2.1
SETB P2.2
CALL DELAY
CLR P2.2
CALL DELAY
MOV R1,#7
LAP2:
CLR P2.0
SETB P2.1
CLR P2.1
SETB P2.2
CLR P2.2
CALL DELAY
CALL DELAY
DJNZ R1,LAP2
DJNZ R4,NHAY
RET
 
CTC:;sang nhap nhay led
MOV R4,#3
NHAY1:
MOV R1,#8
LAP3:
SETB P2.0
SETB P2.1
CLR P2.1
DJNZ R1,LAP3
SETB P2.2
CLR P2.2
CALL DELAY
 
MOV R1,#8
LAP4:
CLR P2.0
SETB P2.1
CLR P2.1
DJNZ R1,LAP4
SETB P2.2
CLR P2.2
CALL DELAY
DJNZ R4,NHAY1
RET
 
 
 
DELAY:;chuong trinh tao tre
MOV R0,#200
LOOP:
MOV R2,#200
LOOP1:
DJNZ R2,LOOP1
DJNZ R0,LOOP
RET
END