【正文】 DATA SEGMENT SHUJU DB 0FCH,06H,0DAH,0F2H,66H,0B6H,0BEH,0E0H ；數(shù)碼管的位選 7 DB 0FEH,0F6H,0EEH,3EH,9CH,7AH,9EH,8EH ；設(shè)置 0～ F的十六位數(shù)碼管段碼 VA1 DB 0FEH,OFDH,0FBH,0F7H,0EFH,0DFF VA2 DB 05H,06H,07H,0AH,0BH,0CH ；設(shè)置四位查詢位 DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA,SS： STACK START: MOV AX,DATA MOV DS,AX MOV DX,0606H MOV AL,80H ； 8255初始化 OUT DX,AL A: LEA SI,VA2 LEA DI,VA1 MOV CX,0006H A1: MOV DX,0600H MOV AL,0FFH OUT DX,AL MOV AL,[DI] MOV BX,OFFSET SHUJU XLAT SHUJU ；查表取出數(shù)碼管的段碼 MOV DX,0604H OUT DX,AL MOV DX,0600H ；查表的段碼送 A口顯示 MOV AL,[SI] OUT DX,AL CALL DALLY INC SI INC DI LOOP A1 JMP A DALLY: PUSH CX ；延時程序 MOV CX,0001H A3: MOV AX,00FFH A4: DEC AX JNZ A4 LOOP A3 POP CX RET CODE ENDS END START 題目：將 8 個健按實驗室要求定義健值，按任意鍵在顯示器上顯示對應(yīng)鍵值，要求顯示值能夠?qū)崿F(xiàn)左移功能： A B 9 3 4 6 F C 流程圖 . 8 源程序： STACK SEGMENT STACK DW 32 DUP (?) STACK ENDS DATA SEGMENT TABLE DB 0FCH,06H,0DAH,0F2H,66H,0B6H,0BEH,0E0H DB 0FEH,0F6H,0EEH,3EH,9CH,7AH,9EH,8EH VA1 DB 0FEH,OFDH,0FBH,0F7H,0EFH,0DFF VA2 DB 0FCH,0FCH,0FCH,0FCH,0FCH,0FCH VA3 DB 00H,00H,00H,00H,00H,00H,00H DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START: MOV AX,DATA MOV DS,AX MOV DX,0606H MOV AL,82H OUT DX,AL ； 8255初始化 MOV BX,0000H STT: MOV AL,00H ； 鍵盤測試 MOV DX,0600H OUT DX,AL MOV DX,0602H IN AL,DX AND AL,18H CMP AL,18H JNZ KEYABC CALL DISP ； 調(diào) 用顯示程序 JMP STT ； KEYABC: CALL TIME ； 延時 ， 去抖動 MOV DX,0602H IN AL,DX AND AL,18H CMP AL,18H JNZ KEY JMP STT KEY: MOV DX,0600H 開始 8255 初始化 是否按健 顯示掃描 保存數(shù)據(jù) 是否 放鍵 顯示掃描 N Y N Y 9 MOV AL,0FEH ； 鍵盤掃描識別 OUT DX,AL MOV DX,0602H IN AL,DX TEST AL,08H JNZ KEY_7 CALL KEY0 JMP STTK KEY_7: TEST AL,10H JNZ KEY_2 CALL KEY4 JMP STTK KEY_2: MOV DX,0600H MOV AL,0FDH OUT DX,AL MOV DX,0602H IN AL,DX TEST AL,08H JNZ KEY_6 CALL KEY1 JMP STTK KEY_6: TEST AL,10H JNZ KEY_1 CALL KEY5 JMP STTK KEY_1: MOV DX,0600H MOV AL,0FBH OUT DX,AL MOV DX,0602H IN AL,DX TEST AL,08H JNZ KEY_5 CALL KEY2 JMP STTK KEY_5: TEST AL,10H JNZ KEY_0 CALL KEY6 JMP STTK KEY_0: MOV DX,0600H MOV AL,0F7H OUT DX,AL MOV DX,0602H IN AL,DX TEST AL,08H JNZ KEY_4 CALL KEY3 JMP STTK KEY_4: TEST AL,10H JNZ KEY_C1 CALL KEY7 KEY_C1: JMP STTK ； ；按鍵 0處理子程序 KEY0: CALL LP1 MOV AL,0EEH MOV [SI+5],AL MOV AL,00H MOV [DI+5],AL CALL DISP ；顯示 RET ；返回 ； ；按鍵 1處理子程序 KEY1: CALL LP1 MOV AL,3EH MOV [SI+5],AL MOV AL,01H MOV [DI+5],AL CALL DISP ；顯示