The new Scenix chips are supposed to comply with some UL 98 standard that
requires the microcontroller to verify the integrity of the code.  Does anyone
have the details of this standard?  Several microcontrollers allow access to the
ROM code, so a checksum is possible.  However, how do I know an ROM error does
not exist in the code that I wrote to check the ROM?  Will the new Scenix chip
have a hardware checksum circuit?
How important is this checksum?
The new AVR does not allow user access to the ROM, is it unusable in safety
circuits?

Thanks.

----- Steve


>Don't use a 16CXXX PIC. If you cannot verify program integrity at
>startup, you shouldn't use it in medical applications.

>You can, however, calculate some sort of a checksum on the 17CXXX's.

>--
>Friendly Regards
>
>Tjaart van der Walt
>mailto:tjaart@wasp.co.za