Lpc2000

What about a simple brute force hardware approach that 
1. Forces P0.14 high as soon as power is available.
2. Turns off the brute force during initialisation.

It is not pretty and depending on implementation may cost more power 
than you might like.

John Heenan



--- In lpc2000@yahoogroups.com, "misstero" <suriyant@...> wrote:
>
> 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.
>