Lpc2000

Dear All,

I have design which is connected modem signals to UART1 (Full UART) of
LPC2xxxx but I found serious problem with DCD signal.

DCD signal of UART1 is alternate function on P0.14 which is LPC2xxx
bootloader determine during reset to go into Bootloader mode if it low.

Our problem occur when modem connected that DCD is active (Active Low
same as bootloader mode request) and LPC2xxx is reseted which may
cause by unstable power or external reset via RESET pin by
supervisory. This made LPC2xxx  go into bootloader mode forever cannot
return back to our application code even modem's DCD inactive later.
Only power cycle both LPC2xxx and modem to restart it to application
code. This case unaccetable when devices are installed in unman location.

I have an idea to solve this problem but it need help from Philips by
add time-out in Bootloader mode if it does not have any activity for
short period of time (etc. 3s) it should be retry to execute
application code repeatly so I'd like to ask Philips is it possible?

Anyone have other ideas to solve this problem? Please share with me. I
prefer to solve by software first if it possible.

Thanks,
Suriyan.