It will be difficult to recover from the noise spike via a purely software technique. A watch dog is a partial solution to force a reset of the processor to start things over. That is provided your software and system design can live with things starting over.

Your other alternatives are to study the what, when, where, and how or the moise spike senario and try to make the electronics design more resistant to susceptabilty. It is generally possible to achieve this goal but there are factors the may affect the outcome....such as...

- Experience level of the hardware designer in building robust designs.

- Management willingness to let you take what you have and re-work it into something that is more robust.

- Available time in the project schedule. Has there been a contingency plan to deal with the possible need to respin PC boards and look at system packaging construction to deal with susceptability issues?

- Available $$$ in the project budget to permit additional engineering to be done.

- Willingness to bring in a possible experience pool in the form of an experienced consultant to help look at the issues and make direct suggestions as to how to aleviate the issues.

Michael Karas