?? zy879.asm
字號(hào):
ORG 0000H
LJMP MAIN
ORG 0013H
LJMP INT1P
MAIN: MOV SP,#60H
SETB EX1
NOP
MOV DPTR,#5FFFH
MOV A,#0DCH
MOVX @DPTR,A
LP: MOVX A,@DPTR
JB ACC.7,LP;等待清屏結(jié)束
MOV A,#00H
MOVX @DPTR,A
MOV A,#34H;時(shí)鐘編程
MOVX @DPTR,A
CLR IT1;觸發(fā)方式設(shè)置
NOP
SETB EA
NOP
MOV R0,#39H;顯示緩沖首址送R0
MOV R7,#06H
LLP: MOV @R0,#00H
INC R0
DJNZ R7,LLP
QC10: LCALL DISY
LJMP QC10
INT1P: PUSH ACC
PUSH DPH
PUSH DPL
MOV A,#40H
MOV DPTR,#5FFFH
MOVX @DPTR,A
MOV DPTR,#5EFFH
MOVX A,@DPTR
MOV 3EH,3DH
MOV 3DH,3CH
MOV 3CH,3BH
MOV 3BH,3AH
MOV 3AH,39H
MOV 39H,A
LCALL DISY
POP DPL
POP DPH
POP ACC
RETI
DISY: MOV R2,#06H
MOV A,#92H
MOV DPTR,#5FFFH
MOVX @DPTR,A
MOV R0,#39H
TY11: MOV A,@R0
MOV DPTR,#TABL
MOVC A,@A+DPTR
MOV DPTR,#5EFFH
MOVX @DPTR,A
INC R0
DJNZ R2,TY11
RET
TABL: DB 0C0H,0F9H,0A4H,0B0H,99H
DB 92H,82H,0F8H,80H,90H,88H
DB 83H,0C6H,0A1H,86H,8EH,8CH
DB 0C1H,89H,0C7H,0BFH,91H
DB 00H,0FFH
END
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