th8.asm

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       org   0
Loop:
       clr   c
       mov   P1.0,c
       Acall  Delay
       setb  c
       mov   P1.0,c
       Acall  Delay
       Ajmp  Loop

Delay: MOV   R5,  #4
A1:    mov   r6, #0FFH
A2:    mov   r7, #0FFH
DLoop: djnz  r7, DLoop
       djnz  r6, A2
       DJNZ  R5, A1
       ret

       end