erik malund wrote:
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At least for the RD2, you can use the internal watchdog, that puppy does not start by itself on reset.
I am adamant (sorry Peter) that an external watchdog is almost worthless since the likelyhood that a runaway program will toggle a port pin is rather large whereas the double write required for an internal puppy is extremely unlikely to happen.

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perhaps instead of simply toggling a port pin
one can use a decoding logic to generate reload for external watchdog?then xram address has to be proper.
also if chip itself fails onchip watchdog shall not serve the purpose while external can.
pranav