piclist 1997\09\16\083204a >
Thread: Human Safety
www.piclist.com/techref/index.htm?key=human+safety
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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
>circuits?

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

antti

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