-----Original Message-----
From: Michael Rigby-Jones <mrjones@NORTELNETWORKS.COM>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Tuesday, February 09, 1999 8:06 AM
Subject: Re: [OT]Re: Failure modes (was: wierd jump)


>I may have slightly exagerated here.  If you look at the footnotes on the
>last page of a data sheet it says "Use of  Microchip's products as critical
>components in life support systems is not authorised except with express
>written approval by Microchip"
>
>Most PIC's are unable to access code memory through instructions, and
>therefore cannot perform a CRC check on their own code, a function that is
>most certainly required for safety critical applications.  I think I have
>seen written (in the PIC list) that some newer devices may be able to do
>this.

The entire line of Scenix micro controllers can do this with the IREAD
command. The low 8 bits of the instruction are returned in W and the high
four are returned in the MODE register.
                                    Keith Causey
>
>Regards
>
>Mike Rigby-Jones
>mrjones@nortelnetworks.com
>
>
>> At 08:42 09/02/99 +0000, you wrote:
>> >for this kind of thing, Microchip definately say PICs are not to be used
>> in
>> >saftey critical applications.
>> >
>>
>> Can you point me to your source on this one?
>>
>> Rgds...
>>
>> ...Andy
>>
>