【正文】 除法程序 MOV B, DATA222 DIV AB MOV DATA111,A MOV BIAOZHI2 ,00H MOV LEDBUF+0,03FH MOV LEDBUF+1,03FH MOV LEDBUF+2,03FH XS: MOV B, 10 。減法程序 SUBB A, DATA222 MOV DATA111,A MOV BIAOZHI2 ,00H MOV LEDBUF+0,03FH MOV LEDBUF+1,03FH MOV LEDBUF+2,03FH LJMP XS CHENG: MOV A, DATA111 。存在 DIZHI1 和 DIZHI2 中 MOV A, DPH MOV DIZHI1, A MOV A, DPL MOV DIZHI2, A MOV LEDBUF+0,03FH MOV LEDBUF+1,03FH MOV LEDBUF+2,03FH ZHUAN: LJMP MLOOP JIA: MOV A, DATA111 。址存在 DIZHI1 和 DIZHI2 中 MOV A,DPH MOV DIZHI1, A MOV A, DPL MOV DIZHI2, A MOV LEDBUF+0,03FH MOV LEDBUF+1,03FH MOV LEDBUF+2,03FH LJMP MLOOP Cu: CJNE R3, 0DH, ZHUAN 。DIZHI1 和 DIZHI2 中 MOV A, DPH MOV DIZHI1, A 23 MOV A,DPL MOV DIZHI2, A MOV LEDBUF+0,03FH MOV LEDBUF+1,03FH MOV LEDBUF+2,03FH LJMP MLOOP CE: CJNE R3,0CH, CU 。存在 DIZHI1 和 DIZHI2 中 MOV A,DPH MOV DIZHI1, A MOV A,DPL MOV DIZHI2, A MOV LEDBUF+0,03FH MOV LEDBUF+1,03FH MOV LEDBUF+2,03FH LJMP MLOOP JN: CJNE R3, 0BH, CE 。轉(zhuǎn)到本次輸入的算法程序 JA: CJNE R3, 0AH, JN 。將 R4 清零 MOV A,DIZHI1 。將 01H 給 R4，說明已有運算符輸入 CJNE R3,0EH,JA 。顯示第一次輸入的數(shù)值 SHUZI1: MOV A,BIAOZHI2 CJNE A,00H , DA21 INC BIAOZHI2 21 MOV A,R3 MOV DATA21,A LJMP LJ21 DA21: MOV A,BIAOZHI2 CJNE A,01H ,DA22 INC BIAOZHI2 MOV A, R3 MOV DATA22,A LJMP LJ22 DA22: MOV A,BIAOZHI2 CJNE A,02H ,D222 INC BIAOZHI2 MOV A,R3 MOV DATA23,A LJMP LJ23 LJ21: MOV DATA222 ,A LJMP D222 LJ22: MOV A,DATA21 MOV B,10 MUL AB ADD A,DATA22 MOV DATA222 ,A LJMP D222 LJ23: MOV A,DATA21 MOV B,100 MUL AB MOV DATA222,A MOV A,DATA22 MOV B,10 22 MUL AB ADD A,DATA222 ADD A,DATA23 MOV DATA222,A D222: MOV A,DATA222 LJMP XS 。判斷是否有運算符輸入， JNZ SHUZI1 。 判斷是數(shù)字鍵還是功能鍵？ FOLLOW:JC SHUZI 。判斷是否為清零鍵 ? MOV R3,00H 。 無鍵入，繼 續(xù)顯示 ACALL DELAY10MS LCALL LKEY1 。 顯示 LCALL KEY1 。段控口地址 MOVX DPTR,A 。初始化 PC MOV A,0FFH MOVX DPTR,A /*ALOOP: MOV DPTR,PAPORT MOV A,0EFH MOVX DPTR,A 。初始化 PA MOV A,0FFH MOVX DPTR,A MOV DPTR,0D2FFH 。延遲程序 MOV R7,40 AJMP DLY1 DELAY1MS: MOV R7,4 DLY1: MOV R6,123 DLY2: DJNZ R6,DLY2 NOP DJNZ R7,DLY1 RET START: MOV SP,40H MOV LEDBUF+0,03FH MOV LEDBUF+1,03FH MOV LEDBUF+2,03FH MOV DPTR,0D7FFH 。列線加 1 MOV A,R2 JB ,KND 。鍵碼存在 R3 中 RET 。計算鍵碼值 PUSH ACC LKEY3: ACALL DELAY10MS 。第二行 MOV A,04H AJMP LKEYP LTHR: JNB ,NEXT 。第四行 MOV A,0CH AJMP LKEYP LONE: JNB ,LTWO 。掃描列線 MOV R1,00H LKEY4: MOV DPTR,0D5FFH MOV A,R2 MOVX DPTR,A ACALL DE