harware flow control

Hello,

I use the DSPS sample with hardware flow control on pins :
TX : p1.0
RX : p1.2
RTS : p0.7
CTS : p0.5

I use a PAN1740 USB devkit and a pad that receive serial over bluetooth data from module.
When I plug a line (RTS or CTS) from my PIC to the module, this one crash (maybe reset) after a little time...