Lpc2000

It depends what your reliability requirements are.

The internal watchdog is disabled at reset, and the WDTC register can 
be written to at any time (writing a large value to this register 
effectively disable the watchdog by making the timeout period in the 
minutes range), so if you need a reliable watchdog you should 
consider adding an external one.


--- In lpc2000@yahoogroups.com, "smt5211" <from-yahoo@d...> wrote:
> 
> Hi,
> 
> I was viewing the schematic for a LPC2106 based design (see 
> http://www.mct.net/product/dil2106/schema.pdf). It included a 
NPC303 
> external watchdog chip. Is this needed if we are not running our 
> design off batteries?
> 
> Regards,
> Shane.