> I'd like it to have a processor from the ARM family, although I'm not par=
ticularly
> opposed to a different processor family if it meets or exceeds the operat=
ing
> temperature recommendation.  In the past we've run into trouble where the=
 processor
> is spec'ed to work across that range but the oscillator won't start up mu=
ch below -
> 30C.  We've had other types of failures at the high (hot) end of the rang=
e.

Talk to Microchip, they are helpful in this regard, and have said in presen=
tations that I have attended that they are prepared to help. I am aware of =
people using Microchip processors down bore holes at greater temperatures t=
han you are suggesting.

>=20
> Other particulars:
>=20
> At a bare minimum, at least 64K of code space (flash-based) and at least =
32K of RAM.
> Code will likely be written in C/C++.

The larger PIC24E/33E may just meet the RAM, while easily exceeding the ROM=
 requirement. I haven't kept up with the PIC32 capabilities, but suspect th=
ere will be something there as well. Also Microchip has SPI/I2C RAM chips i=
f you have low speed access requirements but need to expand the RAM.

>=20
> Support for both RS-422 serial and 10/100 Ethernet.  Other board peripher=
als (e.g.
> A/D, GPIO, etc.) are not needed and would not be used.
>  No display or keyboard/keypad are required.

Well, RS422 is down to the interface chips you use between the UART and the=
 rest of the world, Microchip have 10/100 on board PIC32 chips, but I don't=
 think they do on PIC24/33, and even if a chip doesn't have it but satisfie=
s other requirements they have external 10/100 chips as well as a myriad of=
 wireless ones.


--=20
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--=20
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