1. Phím + Led đơn: Bấm phím nào led hiển thị nút đó.
ORG 00H; Designer By ChipKool
MAIN:
MOV P2,#00000000B
KEY1:
JNB P1.4,KEY1OK
CLR P2.0
CALL DELAY
JMP KEY2
KEY1OK:
SETB P2.0
CALL DELAY
KEY2:
JNB P1.5,KEY2OK
CLR P2.1
CALL DELAY
JMP KEY3
KEY2OK:
SETB P2.1
CALL DELAY
KEY3:
JNB P1.6,KEY3OK
CLR P2.2
CALL DELAY
JMP KEY4
KEY3OK:
SETB P2.2
CALL DELAY
KEY4:
JNB P1.7,KEY4OK
CLR P2.3
CALL DELAY
JMP KEY1
KEY4OK:
SETB P2.3
CALL DELAY
JMP KEY1
JMP MAIN
DELAY:
MOV R0,#200
LOOP:
MOV R1,#150
LOOP1:
DJNZ R1,LOOP1
DJNZ R2,LOOP
RET
END
2.Phím + 7 đoạn : Bấm nút tăng dần từ 0 - 9
ORG 00H; Designer By ChipKool
MAIN:
KEY0:
JNB P1.7,KEY0OK
JMP KEY1
KEY0OK:
CALL CTHT
INC R0
KEY1:
JNB P1.6,KEY1OK
JMP KEY0
KEY1OK:
CALL CTHT
DEC R0
JMP KEY0
JMP MAIN
CTHT:
MOV R7,#5
QUET:
MOV A,R0
MOV B,#10
DIV AB
MOV DPTR,#MALED
MOVC A,@A+DPTR
MOV P3,A
CALL DELAY
MOV A,B
MOVC A,@A+DPTR
MOV P2,A
CALL DELAY
DJNZ R7,QUET
RET
MALED:DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H
DELAY:
MOV R2,#150
LOOP:
MOV R1,#200
LOOP1:
DJNZ R1,LOOP1
DJNZ R2,LOOP
RET
END
ORG 0000H; Designer By ChipKool
MAIN:
JNB P1.0,THUAN_R
JNB P1.1,NGHICH_R
JNB P1.2,THUAN_H
JNB P1.3,NGHICH_H
JNB P1.4,STOP
JMP MAIN
THUAN_R:
SETB P3.0
CLR P3.1
JMP MAIN
NGHICH_R:
CLR P3.0
SETB P3.1
JMP MAIN
THUAN_H:
SETB P3.2
CLR P3.3
JMP MAIN
NGHICH_H:
CLR P3.2
SETB P3.3
JMP MAIN
STOP:
CLR P3.0
CLR P3.1
CLR P3.2
CLR P3.3
JMP MAIN
CALL DELAY
DELAY:
MOV R0,#200
LOOP:
MOV R1,#250
LOOP1:
NOP
DJNZ R1,LOOP1
DJNZ R0,LOOP
RET
END
4. Phím + LCD
5. Phím + 74HC151
nguon:echipkool
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