Re: Fast uC with CAN

From: Casey (cclremovethispart_at_cox.net)
Date: 04/27/04 

Date: Mon, 26 Apr 2004 18:32:51 -0500

Dave Williams said...

> I'm looking for a uC with the following qualities,
>
> 1. CAN controller
> 2. UART (for RS232 to at least 115200)
> 3. FLASH memory (min 32K, min 100,000 write cycles, prefer writable
> while running code though not necessary)
> 4. RAM (min 1K)
> 5. Reasonably fast (must be able to read all incomming CAN messages at
> fastest rate (1MBPS) and be able to do a binary search (max 6
> iterations) to determine if message is of interest. Suspect 16/32bit
> uC @30-40MHz would be adequate.
> 6. Cheap and low power are desirable qualities (looking to produce 1K
> quantities per year).

A Motorola 5282 Coldfire will certainly do what you want. It has 512K
of on-chip FLASH, 64K of RAM, a FlexCAN module, and is plenty fast
enough.
 
> Most uC with CAN have AtoD and other peripherials that are not
> required. I have no preference for actual CPU arch, just want best
> match to my requirements.

If the price is right, just don't use the extra stuff. A lot of the
pins on the 5282 have multiple functions assigned to them and can be
used as digital ports if the alternate uses aren't required.

Good luck...

Casey

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