單片機與單片機串行通訊+鍵盤掃描+數(shù)碼管顯示
                                       


發(fā)送的子程序： 

      MOV TMOD，#20H

      MOV SCON,#11010000B
      ANL PCON,#01111111B
      MOV TH1,#0FDH
      MOV TL1,#0FDH
      SETB TR1

 ALOOP1: INC R7
             MOV A,R7
             MOV 35H,A
             MOV SBUF,#0E1H
             JNB TI,$
             CLR TI
             JNB RI,$
             CLR RI
             MOV A,SBUF
             XRL A,#0E2H
             JNZ ALOOP1
     ALOOP2: MOV R0,#30H
             MOV R7,#06H
             MOV R6,#00H
     ALOOP3:MOV SBUF,@R0
            MOV A,R6
            ADD A,@R0
            MOV R6,A
            INC R0
            JNB TI,$
            CLR TI
            DJNZ R7,ALOOP3
            MOV SBUF,R6
            JNB TI,$
            CLR TI
            JNB RI,$
            CLR RI
            MOV A,SBUF
            CJNE A,#00H,ALOOP2
            CLR TI 
            CLR RI
            RET

接收子程序：

      MOV TMOD，#20H

      MOV SCON,#11010000B
      ANL PCON,#01111111B
      MOV TH1,#0FDH
      MOV TL1,#0FDH
      SETB TR1

BLOOP1:
          JNB RI,$
          CLR RI
          MOV A,SBUF
          XRL A,#0E1H
          JNZ BLOOP1
          MOV SBUF,#0E2H
          JNB TI,$
          CLR TI
    RETT: MOV R0,#30H
          MOV R7,#06H
          MOV R6,#00H
    BLOOP2:JNB RI,$
          CLR RI
          MOV A,SBUF
          MOV @R0,A
          INC R0
          ADD A,R6
          MOV R6,A
          DJNZ R7,BLOOP2
          JNB RI,$
          CLR RI
          MOV A,SBUF
          XRL A,R6
          JZ END1
          MOV SBUF,#0FFH
          JNB TI,$
          CLR TI
          AJMP RETT
       END1:MOV SBUF,#00H
            JNB TI,$
            CLR TI
            CLR RI
            AJMP BLOOP1

中斷顯示，數(shù)碼管顯示：

;針對實驗板的鍵盤掃描，顯示程序
;使用中斷T0進行鍵盤的掃描和T1進行顯示
;顯示緩沖區(qū)設在30H到35H里
;***********************初始化程序*********************
ORG 0000H
AJMP MAIN
ORG 000BH
AJMP IT00


ORG 0030H
MAIN: MOV R0,#7FH
LOOP: MOV @R0,#00H
      DJNZ R0,LOOP
      MOV SP,#70H
      MOV 37H,#30H ;把30H的一個緩沖區(qū)第一位保存，以后作為指針來用
      MOV 09H,#30H ;把30H放到第一組工作寄存器R1中
      MOV 08H,#30H ;把30H放到第一組工作寄存器R0中
      MOV 0CH,#20H

      CLR 00H
      CLR 01H
      CLR 02H ;初始化位地址00H，01H，02H
      MOV TMOD,#01H
      MOV TH0,#0FCH
      MOV TL0,#018H
      SETB TR0
      SETB ET0
      SETB EA ;啟動定時
 HEAR:

      AJMP HEAR
 ;*******************************中斷T0鍵盤+顯示**********************
 IT00:
     CLR EA
     PUSH ACC
     PUSH B
     PUSH PSW
     PUSH DPH
     PUSH DPL
     SETB RS0
     CLR RS1
     MOV DPTR,#1FFFH
     MOV A,#00H
     MOVX @DPTR,A
     JB P1.7,PASS0
     JB 00H,CP
     SETB 00H
     AJMP PASS
 CP:JB 01H,PASS
    SETB 01H
    AJMP KEYSELECT
;*********************判斷健盤的具體位置********************
KEYSELECT:
     MOV A,#0FEH
     MOVX @DPTR,A
     JNB  P1.7,KEYS5
     RL A
     MOVX @DPTR,A
     JNB P1.7,KEYS4
     RL A
     MOVX @DPTR,A
     JNB P1.7,KEYS3
     RL A
     MOVX @DPTR,A
     JNB P1.7,KEYS2
     RL A
     MOVX @DPTR,A
     JNB P1.7,KEYS9
     RL A
     MOVX @DPTR,A
     JNB P1.7,KEYS8
     RL A
     MOVX @DPTR,A
     JNB P1.7,KEYS7
     RL A
     MOVX @DPTR,A
     JNB P1.7,KEYS6
;******************************鍵盤功能模塊**************************
     KEYS4:
      AJMP PASS

KEYS6:JB 02H,PASS
      MOV A,@R0
      MOV R5,A
      INC R5
      MOV A,R5
      MOV @R0,A
      CJNE R5,#0AH,PASS
      MOV @R0,#00H
      AJMP PASS
KEYS7:JB 02H,PASS
      MOV A,@R0
      MOV R5,A
      DEC R5
      MOV A,R5
      MOV @R0,A
      CJNE R5,#0FFH,PASS
      MOV @R0,#09H
      AJMP PASS

KEYS8:JB 02H,PASS

      MOV R0,37H
      INC R0
      MOV 37H,R0
      CJNE R0,#36H,PASS
      MOV 37H,#30H
      MOV R0,37H
      AJMP PASS
KEYS2:
      AJMP PASS
KEYS5:
       CPL 02H
      AJMP PASS
KEYS3:AJMP PASS
KEYS9:AJMP PASS
;************************鍵盤功能結束******************************
 PASS0:
     CLR 00H
     CLR 01H
 PASS:
 ;****************************中斷T1顯示***************************
         MOV  A,@R1
         mov  dptr, #tab
         MOVC  A,@A+DPTR
         MOV R2,A
         JB 02H,RE
;*********************閃爍程序**********************
         MOV A,R0
         CLR C
         SUBB A,R1
         JNZ RE
         INC R3
         MOV A,R3
         SUBB A,#4FH
         JNC RE
         MOV A,#0FFH
         MOV DPTR, #9FFFH
         MOVX @DPTR,A
         AJMP RE1

   RE:
  MOV  dptr,#09FFFH
         MOV A,R2
         MOVX @DPTR,A

   RE1:  MOV A,R4
         MOV DPTR,#7FFFH
         MOVX @DPTR,A

         INC   R1
         MOV   A,R4
         JB    ACC.0,FORMAT
         RR    A
         MOV   R4,A
         AJMP EXIT
FORMAT:  MOV  R1,#30H
  MOV  R4,#20H

 EXIT:  MOV TH0,#0FCH
         MOV TL0,#018H
         POP DPL
         POP DPH
         POP PSW
         POP B
         POP ACC
         SETB EA
         RETI

TAB:          DB  0c0H, 0f9H, 0a4H, 0b0H, 99H, 92H
;                   0    1    2    3    4    5
;                  00H  01H  02H  03H  04H  05H
;
               DB  82H, 0f8H, 80H, 90H   0FFH
;                   6    7    8    9
;                  7DH  07H  08H  09H     0A
;
           end