lesson6-2.asm

单片机实验

 ORG  0000H
     LJMP REVB
     
REVB :MOV TMOD,#20H
      MOV  TH1,#0E8H
      MOV  TL1,#0E8H
      MOV  PCON,#00H
      SETB  TR1
      MOV SCON ,#50H
R1B:  JBC  RI,R2B
      SJMP  R1B
R2B:  MOV A, SBUF
      XRL  A,#0AAH
      CLR TI
      JZ T1B
      SJMP R1B
T1B:  MOV SBUF ,#55H
S1B:  JBC TI,R3B
       SJMP  S1B
R3B:   JNB RI,$
      CLR RI
      MOV A ,SBUF
     MOV R7,A
     MOV R0,#40H
     MOV R6,#00H
R4B: JBC RI, R5B
     SJMP R4B
R5B: MOV A, SBUF
     MOV @R0 ,A
     INC R0
     ADD A,R6
     MOV R6,A
     DJNZ R7, R4B      
R6B: JBC RI,R7B
     SJMP R6B
R7B: MOV A,SBUF 
     XRL A,R6
     JZ ENDB
     MOV SBUF, #0FFH
S3B:  JBC TI,R3B
       SJMP S3B
ENDB:  MOV SBUF ,#00H
ENDB1:JBC TI,STOP
      SJMP ENDB1
STOP  :RET
      END