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AT89S8351 development board

hello everyone. I have a development board having an AT89S8352 microcontroller. I cannot communicate this board with the keil. Can anyone help me for this? I wrote a simple program as given below:

org 0000h sjmp start

start:
;;;;;;;;;;;;;;;;;;;;;;cleaning the memory ;mov r0, #7fh
x1: mov @r0,#00h ;djnz r0, x1 ;mov @r0,#00h
;;;;;;;;;;;;;;;;;;;;;;;; mov p0,@r0
x: sjmp x end