Lpc2000

I'm going to deal with the same in a week or two. I'll get back to you if I 
figure out something.

Kerem

----- Original Message ----- 
From: "Karl Olsen" <kro@...>
To: <lpc2000@yahoogroups.com>
Sent: Thursday, December 16, 2004 6:53 PM
Subject: [lpc2000] LPC2114 watchdog reset, was:Reset of circuit


>
>
>
> It boots fine from flash at power on, so the checksum etc. is OK.
> And when it hangs after a watchdog "reset", pulling RESET# low can
> also reboot it correctly.
> So has anybody actually seen the watchdog reset work?
>
> Karl Olsen
>
>
> --- In lpc2000@yahoogroups.com, "Kerem Or" <k.or@s...> wrote:
>>
>> according to user manual:
>>
>> if P0.14 is high while RESET#=0 then LPC attempts to execute user
>> code (if a valid csum found at addr 0x14). It does not enter ISP
>> mode. I suppose this is your case as described below
>>
>> If P0.14 is low while RESET#=0 but also the watchdog overflow flag
>> is set, then LPC ignores the state of P0.14 and attempts to start
>> user code.
>>
>> In both cases a valid checksum is required at location 0x14 for LPC
>> to execute user code
>>
>> more details in the manual (p217)
>>
>> Kerem
>>
>>
>> --- In lpc2000@yahoogroups.com, "Karl Olsen" <kro@p...> wrote:
>> >
>> > --- In lpc2000@yahoogroups.com, "Kerem Or" <k.or@s...> wrote:
>> > > Then let the watchdog expire. It will reset the chip but will
>> not
>> > change the
>> > > state of the reset pin. That means your external hardware (if
>> you
>> > have any)
>> > > connected to the LPC reset pin will not get reset.
>> >
>> > Has anybody done this successfully?
>> >
>> > On my LPC2114, I have tried doing a CPU reset by starting the
>> > watchdog and letting it expire.  But when it expires, the CPU
> just
>> > hangs, without restarting.  P0.14 isn't low, and it hasn't
> entered
>> > ISP mode.  I'm doing like this:
>> >
>> > WDT->WDTC = PCLK_HZ/4; /* Timeout = 1 second */
>> > WDT->WDMOD = 0x03;
>> > WDT->WDFEED = 0xAA;
>> > WDT->WDFEED = 0x55;
>> >
>> > At this time I can see WDTV decrementing, and when it reaches
>> zero,
>> > the system just hangs, and interrupt activity stops.
>> >
>> > Karl Olsen
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