【文章內(nèi)容簡介】 MOV A,R2 MOVX @DPTR,A INC DPTR MOVX A,@DPTR JB LONE MOV A,00H AJMP KCODE LONE: JB ,NEXT MOV A,04H KCODE: ADD A,R4 ACALL LP1 ACALL PUTBUF PUSH ACC KON: ACALL DIS ACALL CLEAR ACALL CCSCAN JNZ KON POP ACC NEXT: INC R4 MOV A,R2 JNB ,KERR RL A MOV R2, A AJMP COLUM KERR: AJMP BEGIN CCSCAN: MOV DPTR,7F02H MOV A,00H MOVX @DPTR,A INC DPTR MOVX A,@DPTR CPL A ANL A,30H RET CLEAR: MOV DPTR,7F01H MOV A,00H MOVX @DPTR,A RET DIS: PUSH ACC PUSH 00H PUSH 03H MOV A,03H MOV DPTR,7F00H MOV R0,50H MOV R3,0F7H MOV A,R3 AGAIN: MOV DPTR,7F02H MOVX @DPTR,A MOV DPTR,7F03H MOV A,@DPTR JNB ,STEP1 MOV DPTR ,ADDR AJMP STEP2 STEP1: MOV A,@R MOV DPRT， DDEG AJMP STEP3 STEP2: MOV A,@R STEP3: MOVC A， @A+DPTR MOV DPTR,7F01H MOVX @DPTR,A ACALL DL1MS INC R0 MOV A,R3 JNB ,OUT RR A MOV R3,A AJMP AGAIN OUT: POP 03H POP 00H POP ACC RET DDEG: DB 9EH,3EH,0F2H,0DAH 0F6H,0FEH,0EEH,8EH ADDR: DB 0B6H,0BEH,0FCH,66H, 60H,0E0H,9CH,7AH DL1MS: MOV R7,01H DL0: MOV R6,0FFH DL1 DJNZ R6,DL1 DJNZ R7,DL0 RET PUTBUF: PUSH 00H MOV R7,A MOV A,52H MOV 53H,A MOV A,51H MOV 52H,A MOV A,50H MOV 51H,A MOV A,R7 MOV 50H,A POP 00H RET END 3. a） .定義鍵盤按鍵， 5 個數(shù)字鍵 E4689 ,3 個功能鍵：乘號 x，減號 ，等號＝； b） .可進(jìn)行三位 10 進(jìn)制減法運(yùn)算； c） .可進(jìn)行兩位 16 進(jìn)制乘法運(yùn)算 ORG 0000H LJMP MAIN ORG 0100H DDEG:DB 3FH,06H,5BH,4FH,66H, DB 6DH,7DH,07H,7FH,6FH, DB 77H,7CH,39H,5EH,79H,71H ORG 1000H MAIN: MOV 52H,00H MOV 53H,00H MOV 51H,00H MOV 50H,00H MOV 37H,00H MOV 38H,04H MOV 39H,01H MOV 40H,00H MOV 41H,00H MOV 42H,00H MOV 43H,00H MOV 44H,00H MOV 45H,00H MOV 46H,00H MOV 47H,00H MOV R5,50H KEYSUB: MOV A,03H MOV DPTR,7F00H MOVX @DPTR,A BEGIN: ACALL DIS ACALL CLEAR ACALL CCSCAN JNZ INK1 AJMP BEGIN INK1: ACALL DIS ACALL DL1MS ACALL DL1MS ACALL CLEAR ACALL CCSCAN JNZ INK2 AJMP BEGIN