微機課程設(shè)計之計數(shù)器(編輯修改稿)
2025-02-12 15:25 本頁面
【文章內(nèi)容簡介】 JNZ DIR1 JMP DIR0DIR5： MOV CX,0006H JMP DIRDIR4： MOV CX,0005H JMP DIRDIR3： MOV CX,0004H JMP DIRDIR2： MOV CX,0003H JMP DIRDIR1： MOV CX,0002H JMP DIRDIR0： MOV CX,0001HDIR: MOV DX,0600H MOV AL,[SI] OUT DX,AL MOV DX,0604H MOV AL,[DI] OUT DX,AL CALL TIME INC SI INC DI LOOP DIR RET；；延時程序TIME: PUSH AX PUSH CX MOV CX,0005HTIME1: MOV AX,00F0HTIME2: DEC AX JNZ TIME2 LOOP TIME1 POP CX POP AX RET； ；放鍵測試程序STTK: CALL DISP MOV AL,00H MOV DX,0600H OUT DX,AL MOV DX,0602H IN AL,DX AND AL,18H CMP AL,18H JNZ STTK JMP STTCODE ENDS END START ：實現(xiàn)：a)定義鍵盤按鍵，13個為數(shù)字鍵0F，3個功能鍵：加號+，除號247。，等號＝；b)可進行四位10進制加法運算；c)可進行四位16進制除法運算。 流程圖 開始8255初始化有無壓鍵顯示掃描是數(shù)字鍵？標有志？加號？除號？設(shè)加好標志設(shè)除好標志清零顯示器，清標志位保存數(shù)據(jù)放鍵？顯示掃描清零顯示器進行加、乘運算，存結(jié)果等號？YYYYYYYNNNNNN：STACK SEGMENT STACK DW 64 DUP(?)STACK ENDSDATA SEGMENT VA1 DB 0DFH,0EFH,0F7H,0FDH,0FEH, VA2 DB 0FC,0FCH,0FCH,0FCH,0FCH,0FCH,0FCH,0FCH,0FCH,0FCH VAR3 DB 00H,00H,00H,00H,00H,00H,00H,00H,00H,00H VAR4 DB 00H,00H,00H,00H,00H,00H,00H,00H,00H,00H TABL DB 0FCH,60H,0DAH,0F2H,66H,0B6H,0BEH,0FEH,0F6H, DB 0EEH,3EH,9CH,7AH,9EH,8EHDATA ENDSCODE：SEGMENT ASSUME CS:CODE,DS,DATA START:MOV AX,DATA MOV DS,AX MOV DX,0606H MOV AL ,82H OUT DX,AL MOV BX,0000H STT: MOV AL,00H MOV DX,0600H OUT DX,AL OUT DX,0602H IN AL,DX AND AL,78H CMP AL,78H JNZ KEYABC CALL DISP JMP STTKEYABC:CALL TIME MOV DX,0602H IN AL,DX AND AL,78H CMP AL,78H JNZ KEY JMP STT。第一列鍵盤掃描；按鍵鍵碼確定程序,采用掃描法確定按鍵的鍵碼KEY: MOV DX,0600H MOV AL,OFEH OUT DX,AL MOV DX,0602H IN AL,DX TEST AL,08H JNZ KEY_B CALL KEYF JMP STTK KEY_B:TEST AL,10H JNZ KEY_7 CALL KEYB JMP STTK KEY_7:TEST AL,20H JNZ KEY_JIA CALL KEY7 JMP STTK KEY_JIA:TEST AL,40H JNZ KEY_E CALL KEYABB JMP STTK 。 。 第二列鍵盤掃描 KEY_E:MOV DX,0600H MOV AL,OFDH OUT DX,AL MOV DX,0602H IN AL,DX TEST AL,08H JNZ KEY_A CALL KEYF JMP STTK KEY_A:TEST AL,10H JNZ KEY_6 CALL KEYA JMP STTK KEY_6:TEST AL,20H JNZ KEY_JIA CALL KEY6 JMP STTK KEY_2:TEST AL,40H JNZ KEY_D CALL KEYCHU JMP STTK 。 。 第三列鍵盤掃描 KEY_D:MOV DX,0600H MOV AL,OFBH OUT DX,AL MOV DX,0602H IN AL,DX TEST AL,08H JNZ KEY_9 CALL KEYD JMP STTK KEY_9:TEST AL,10H JNZ KEY_5 CALL KEY9 JMP STTK KEY_5:TEST AL,20H JNZ KEY_1 CALL KEY5 JMP STTK KEY_1:TEST AL,40H JNZ KEY_D CALL KEYDEN 。等號 JMP STTK 。 。 第四列鍵盤掃描KEY_C:MOV DX,0600H MOV AL,OFBH OUT DX,AL MOV DX,0602H IN A
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