rev.asm

51系列单片机的汇编程序包

  ORG 0000H
  AJMP REV
 REV:MOV TOMD,#20H
      MOV TH1,#F3H
      MOV TL1,#F3H
      SETB TR1
      MOV SCON,#50H
      MOV PCON,#80H
 RPT:MOV R5,#00H
 ;MOV R4,#00H
      MOV R0,#30H
 TR0:JBC RI,TR1
      AJMP TR0
 TR1:MOV A,SBUF
 MOV R3,A
 ADD A,R5
 MOV R5,A
 TR2:JBC RI,TR3
 AJMP TR2
 TR3:;MOV A,SBUF
 ;XRL A,R5
 ;JZ RIGHT
 ;MOV SBUF,#0FFH
 ;WT:JBC RI,RPT
   ;AJMP WT
 ;RIGHT:MOV R5,#00H

 ;MOV SBUF,#00H
 ;TR4:JBC RI,TR5
 ;AJMP TR4
 ;TR5:JBC RI,TR6
 ;AJMP TR5
 ;TR6:
 MOV A,SBUF
 MOV @R0,A
 INC R0
 ADD A,R5
 MOV R5,A
 DJNZ R4,TR2
 TR7:JBC RI,TR8
 AJMP TR7
 TR8:MOV A,SBUF
 XRL A,R5
 MOV R5,#00H
 JZ TR10
 SETB PSW.5
 TR10:DJNZ R3,TR5
 MOV A,R4
 JZ TR19
 TR11:JBC RI,TR12
 AJMP TR11
 TR12:MOV A,SBUF
 XRL A,R5
 JNZ TR13
 AJMP TR20
 TR13:MOV SBUF,#0FFH
  TR14:JBC RI,TR15
  AJMP TR14
  TR15:RET
  TR20:MOV SBUF,#00H