How to use PCE?

Hello,

I'm using sdcc and I'm trying to use PCE0 and PCE1 port on tini. 

my code doesn't work, please help me...

xdata at 0x00100000 ppib1;

main()
{
  int i=0;
  for (i=0; i<65535; i++)
  {
    _asm
    push _MCON
    mov a,_MCON
    anl a,#0xF0
    mov _MCON,a
    _endasm;

    ppib1=0x90;
    _asm
    pop _MCON
    _endasm;
  }
}

Thanks
Vincent.
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