EMC.rar_4 3 2 1_startael

;----------------------------------------------------------- ;file name : scankey2008.320 扫描4*4矩阵键用数码管显示键值 ;----------------------------------------------------------- status == 0x03 port6 == 0x06 ;p60-p63 is scan line即行数 p64-p67 is return line即列数 port7 == 0x07 c == 0 dc == 1 z == 2 ioce == 0x0e temp == 12 cnt == 13 cnt1 == 14 key == 15 ;----------------------------------------------------------- org 0 ;----------------------------------------------------------- reset: mov a,@0x11 iow ioce mov a,@0b11110000 iow port6 mov a,@0b00000000 iow port7 ;----------------------------------------------------------- ;chkkey: call scankey mov a,key mov port7,a jmp chkkey ;----------------------------------------------------------- scankey: mov a,@0b11111111 mov temp,a bc status,c mov a,@4 mov cnt1,a newcol: rlc temp mov a,temp mov port6,a nop coma port6 and a,@0b11110000 jbs status,z jmp trykey djz cnt1 jmp newcol jmp scankey trykey: ;call wait mov a,temp mov port6,a nop com port6 and a,@0b11110000 jbs status,z jmp havekey djz cnt1 jmp scankey ret havekey: swapa port6 and a,@0b00001111 mov temp,a clr cnt next_bit: rrc temp jbs status,c jmp found inc cnt jmp next_bit found: dec cnt1 bc status,c rlc cnt1 rlc cnt1 mov a,cnt add a,cnt1 数码管显示的键值=(行数CNT1乘以4)+列数，p7口规划为数码管输出口，我按按键可没有反应，我想有两个问题：1，按键除跳可能 有问题，2，给数码管的KEY值是要调整为BCD码？ 请帮我确认下整体的程序走向对吗？ daa ？？？？？？？？？？？？ 我要显示的是1.2.3.4.5.6.7.8.9.A.B.C.D.E.F mov key,a ret ;-------------------------------------------------------------- wait: mov a,@0b11110000 mov port6,a nop coma port6 and a,@0b11110000 jbs status,z jmp wait ret ;-------------------------------------------------------------- table: tbl retl 0b00111111 retl 0b00000110 retl 0b01011011 共阴数码管 retl 0b01001111 retl 0b01100110 retl 0b01101101 retl 0b01111101 retl 0b00000111 retl 0b01111111 retl 0b01101111 retl 0b01110111 retl 0b01111100 retl 0b00111001 retl 0b01011110 ;retl 0b01111001 ;retl 0b01110001 org 0fffh jmp reset eop