【正文】 OUT DX,AL CALL DELAY MOV AL,0H MOV DX,B_PORT OUT DX,AL CALL DELAY1 CALL DELAY1 LEA SI,LEDTAB MOV BL,BUF+3 MOV BH,0 MOV AL,[BX][SI] 。用數碼管顯示時十位 MOV AL,11000001B MOV DX,B_PORT OUT DX,AL CALL DELAY MOV AL,0H MOV DX,B_PORT OUT DX,AL CALL DELAY1 DEC DI JNZ DISPAGAIN1 RETDISPLAY_DEC ENDPDELAY PROCMOV CX,1dhLOOP $ RETDELAY ENDPDELAY1 PROCMOV CX,3hLOOP $RETDELAY1 ENDPcunchu proc push ax push bx push cx mov al,buf mov ah,buf+1 mov bl,buf+2 mov bh,buf+3 mov cl,buf+4 mov ch,buf+5 mov buff[si],al mov buff[si+1],ah mov buff[si+2],bl mov buff[si+3],bh mov buff[si+4],cl mov buff[si+5],ch pop ax pop bx pop cx ret cunchu endpxianshicj proc push ax push bx push cx mov al,buff[si] mov ah,buff[si+1] mov bl,buff[si+2] mov bh,buff[si+3] mov cl,buff[si+4] mov ch,buff[si+5]mov buf,almov buf+1,ahmov buf+2,blmov buf+3,bhmov buf+4,clmov buf+5,chpop axpop bxpop cx retxianshicj endp INTB PROC FAR PUSH AX PUSH BX PUSH CX MOV SI,6 MOV AL,20H OUT 20H,AL POP CX POP BX POP AX IRETINTB ENDP CODE ENDS END START21。用數碼管顯示十位 MOV AL,11010000B MOV DX,B_PORT OUT DX,AL CALL DELAY MOV AL,0H MOV DX,B_PORT OUT DX,AL CALL DELAY1 LEA SI,LEDTAB MOV BL,BUF+2 MOV BH,0 MOV AL,[BX][SI] 。dec bx jmp backDISPLAY_DEC PROC DA: MOV DI,2DISPAGAIN1: MOV BL,BUF MOV BH,0 LEA SI,LEDTAB 。DAT3中是時 CMP AL,24 JZ A3 MOV BL,10 DIV BL MOV BUF+4,AH 。秒的十位 CALL DISPLAY_DEC INC DAT1 JMP back A1: MOV DAT1,0 。2007年4月第三次印刷.7參考文獻[1] 楊季文.《匯編語言程序設計教程》清華大學出版社設計結構現實：開機時數碼管顯示為00，每一秒鐘計數器自動加一，按KEY1鍵開始計時，按KEY2鍵停止計時并現實當前數值，按KEY3鍵歸零。鍵盤輸入利用61板自帶的三個按鍵，輸入的端口為IOA0—IOA2。LED與SPCE061A的引腳連接如表21。 基本的半導體數碼