【正文】 原理及應(yīng)用這門專業(yè)課程學習好，除了學好書本知識外還要通過實踐把書本知識應(yīng)用到實踐中去，才能對這門課程有更深的認識，也有利于自己對知識的吸收，鞏固和提高。5A7FB3C0：STACK SEGMENT STACK DW 64 DUP (?)STACK ENDSDATA SEGMENTVAR1 DB 07H,0BH,0DH,0EHVAR2 DB 3FH,3FH,3FH,3FH,3FHVAR3 DB 00H,00H,00H,00H,00HTABL DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H DB 7FH,6FH,77H,7CH,39H,5EH,79H,71HDATA ENDSCODE SEGMENT ASSUME CS:CODE,DS:DATASTART: MOV AX,DATA MOV DS,AX MOV AL,88H OUT 63H,AL ；8255A初始化STT: MOV AL,00H ；鍵盤測試 OUT 60H,ALNEXT: IN AL,62H AND AL,60H CMP AL,60H JNZ KEYABC CALL DISP ；調(diào)用顯示程序 JMP STT；KEYABC: CALL TIME ；延時，去抖動 IN AL,62H AND AL,60H CMP AL,60H JNZ KEY JMP STTKEY: MOV AL,0FEH ；鍵盤掃描識別 OUT 60H,AL IN AL,62H TEST AL,40H JNZ KEY_B CALL KEY5 JMP STTKKEY_B: TEST AL,20H JNZ KEY_A CALL KEYB JMP STTKKEY_A: MOV AL,0FDH OUT 60H,AL IN AL,62H TEST AL,40H JNZ KEY_3 CALL KEYA JMP STTKKEY_3: TEST AL,20H JNZ KEY_7 CALL KEY3 JMP STTKKEY_7: MOV AL,0FBH OUT 60H,AL IN AL,62H TEST AL,40H JNZ KEY_C CALL KEY7 JMP STTKKEY_C: TEST AL,20H JNZ KEY_F CALL KEYC JMP STTKKEY_F: MOV AL,0F7H OUT 60H,AL IN AL,62H TEST AL,40H JNZ KEY_0 CALL KEYF JMP STTKKEY_0: TEST AL,20H JNZ KEY_01 CALL KEY0KEY_01: JMP STTK； ；按鍵5處理子程序KEY5: CALL LP1 ；低4位字節(jié)前移 MOV AL,05H MOV [DI+4],AL LEA BX,TABL ；查表取出要顯示數(shù)字的數(shù)碼管段碼 XLAT TABL MOV [SI+4],AL CALL DISP ；顯示 RET ；返回；KEYB: CALL LP1 ；按鍵B處理子程序 MOV AL,0BH MOV [DI+4],AL LEA BX,TABL XLAT TABL MOV [SI+4],AL CALL DISP RET；KEYA: CALL LP1 ；按鍵A處理子程序 MOV AL,0AH MOV [DI+4],AL LEA BX,TABL XLAT TABL MOV [SI+4],AL CALL DISP RET；KEY3: CALL LP1 ；按鍵3處理子程序 MOV AL,03H MOV [DI+4],AL LEA BX,TABL XLAT TABL MOV [SI+4],AL CALL DISP RET；KEY7: CALL LP1 ；按鍵7處理子程序 MOV AL,07H MOV [DI+4],AL LEA BX,TABL XLAT TABL MOV [SI+4],AL CALL DISP RET；KEYC: CALL LP1 ；按鍵C處理子程序 MOV AL,0CH MOV [DI+4],AL