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mov a,r4 jz Key3 mov r4,#20h dec r2 sjmp Key4 Key3: mov r4,#0fh Key2: mov r2,04h mov r4,03h Key4: mov r1,#48h mov a,r2 mov @r1,a inc r1 mov a,r3 mov @r1,a mov a,r4 jb acc.5,Exit jb acc.4,Exit mov dptr,#KeyTable movc a,@a+dptr Exit: ret ScanKey: setb RS1 mov r2,#0feh mov r3,#08h mov r0,#00h

LoopS: mov r1,#Low(OUTBIT) mov a,r2 movx @r1,a rl a mov r2,a inc r1 movx a,@r1 cpl a anl a,#0fh

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jnz Scan inc r0 djnz r3,LoopS ReTKey3:mov a,#20h TKey3: mov r2,a clr a

mov r1,#Low(OUTBIT) movx @r1,a mov a,r2 clr RS1 ret Scan:

cpl a

jb acc.0,TKey0 mov a,#00h sjmp EndLoop TKey0: jb acc.1,TKey1 mov a,#08h sjmp EndLoop TKey1: jb acc.2,TKey2 mov a,#10h sjmp EndLoop TKey2: jb acc.3,ReTKey3 mov a,#18h EndLoop:add a,r0 sjmp TKey3

LedMap: ;°Ë¶Î¹ÜÏÔʾÂë db 0c0h,0f9h,0a4h,0b0h,099h,092h,082h,0f8h db 080h,090h,088h,083h,0c6h,0a1h,086h,08eh KeyTable: ;¼üÂ붨Òå db 07h,04h,08h,05h,09h,06h,0ah,0bh db 01h,00h,02h,0fh,03h,0eh,0ch,0dh end

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ORG 0000H AJMP MAIN ORG 0790H MAIN: MOV R0, #08H MOV A, #0FEH LOOP: MOV P1, A ACALL DELAY RL A

DJNZ R0, LOOP JMP MAIN

DELAY: MOV TMOD, #10H MOV TL1, #0C0H MOV TH1, #63H SETB TR1 JNB TF1, $ CLR TF1 RET END

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