ORG0000H
LJMPMAIN
ORG0030H
MAIN: ORLp0,#0FH ;在读P0口时先对P0口写1
MOVA,p0
ANLA,#0FH
MOVDPTR,#LED7 ;根据从P0口读到的数据查表,TAB中存放数码管的显示码表
MOVCA,@ADPTR
MOVp1,A ;把码表值送数码管显示
AJMPMAIN
;共阳数码管显示码表
LED7: DB0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H
DB80H,90H,88H,83H,86H,0A1H,86H,8EH
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