piclist 1997\09\16\083204a >
Thread: Human Safety
face BY : Antti Lukats email (remove spam text)

At 07:00 AM 16/9/97 -0600, you wrote:
>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

only AT90S1200 does not have access to ROM, all other AVR variants
can read their ROM contents.


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