chr3.asm

单片机各种通信接口程序

STACK_SEG SEGMENT
  DB 1024 DUP(0)
STACK_SEG ENDS
DATA_SEG SEGMENT
  BUF DW 0F101H,0ABCDH,1234H,9876H
  COUNT =($-BUF)/2
  TISHI DB 'THE RESULT IS:$'
  RESULT DB 5 DUP(?),'$'
DATA_SEG ENDS
CODE_SEG SEGMENT
  ASSUME CS:CODE_SEG,DS:DATA_SEG,SS:STACK_SEG
MAIN: MOV AX,DATA_SEG
      MOV DS,AX
      CALL NDADD
      CALL TOASCII
      MOV DX,OFFSET TISHI
      MOV AH,09H
      INT 21H
      MOV DX,OFFSET RESULT
      MOV AH,09H
      INT 21H
      MOV AX,4C00H
      INT 21H
NDADD PROC
      PUSH DI
      MOV AX,0
      MOV DX,0
      MOV CX,COUNT
      MOV DI,OFFSET BUF
NEXT1:ADD AX,[DI]
      JNC NEXT2
      INC DX
NEXT2:ADD DI,2
      LOOP NEXT1
      POP DI
      RET
NDADD ENDP
TOASCII PROC
      PUSH DI
      MOV CX,4
      MOV DI,OFFSET RESULT
      AND DX,0FH
      ADD DX,30H
      MOV [DI],DL
      MOV BX,AX  
NEXT3:INC DI
      ROL BX,4
      MOV AL,BL      
      AND AL,0FH
      CMP AL,09H
      JLE NEXT4
      ADD AL,07H
NEXT4:ADD AL,30H      
      MOV [DI],AL
      LOOP NEXT3
        POP DI 
        RET
TOASCII ENDP
CODE_SEG ENDS
   END MAIN