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Changing port selection structure

Billod JeanLuc

Hi,

I'm tring to change the port selection structure to use P1 as bidirectional.
I use the following C instructions.

SYSCON |= 0x40;
IP1 |= 0x80;
DIR1  &= 0x00;
The first instructions executed, I lose the serial connection with the uVision's debugger. I think I have change the mode for all the controller port and then reset the serial port pins.
Can I apply this bidirectional mode only for P1, or is it possible to restore the serial connection ?
(I'm using the autobaud mode 7 when compiling the Mon-51)

Thanks!
Jean-Luc

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