[Diy_efi] new EFI controller - CPU selection

[Sid.Young at qml.com.au]

Howdy all,

A 32 bit CPU is most likely an overkill. Most 8 bit CPU's will spend most of
their time being idle waiting for a trigger pulse to start doing anything.

As for controlling blinkers and doors or ABS, each would have there own
sub-systems and hence a single CPU is not realistic. My basic motto after
22years of embedded systems design is "Many processors make light work".

Another thing to think about is, if you are doing embedded control and the
CPU does not even have flash, then it must be pretty crappy, even simple 8
bit CPU's like the z8 have 64K flash, or the 68HC908GP32 have 32K flash.
Even the 8 pin 68HC908QT4 has 4k flash.

Sid


-----Original Message-----
From: Bevan Weiss [mailto:kaizen__ at hotmail.com] 
Sent: Tuesday, 11 March 2003 2:19 PM
To: List for general do-it-yourself EFI talk
Subject: Re: [Diy_efi] new EFI controller


Depends on lots of things, remember that there's much more computing to a
car than just the engine. ie one of the 32bit processors might be the
engine, the other one might take care of such things as the indicators, the
door light, windsheild wipers, central locking, etc. Or it might be just
dedicated to traction control (ie abs), or it may be used in 4WS (4 wheel
steering).  Then again it might be used to adjust the drivers seat via
electronics :) Ya just never really know what they're using for what
application.

The important thing for us to pick up is, Motorola has designed the
MPC555/565/566 as automotive engine control devices.  This means that
there's no fussing around trying to get something simple like an engine
position reference.  It's a simple two instruction kinda thing (damn I love
the TPU :) ) Just think about how hard that would be to code using a TriCore
chip or such. All the onchip FLASH and RAM are added bonuses, no 'need' for
an external bus interface.  (However I think I'll still put one on the
board). It's just a great little chip family.

Thanks for the comments,
Bevan Weiss


----- Original Message -----
From: "Toyota Supra" <turbosupramk3 at hotmail.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, March 11, 2003 4:49 PM
Subject: Re: [Diy_efi] new EFI controller


> i know that the supra ecu uses (2) 32 bit processors, i was told that 
> it
was
> an extremely supreme design for its time, i guess this reiterates 
> such. its good to know that other ecu's are catching up
>
> -j
>
>
>
>
>
> >From: "Bevan Weiss" <kaizen__ at hotmail.com>
> >Reply-To: List for general do-it-yourself EFI talk 
> ><diy_efi at diy-efi.org>
> >To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
> >Subject: Re: [Diy_efi] new EFI controller
> >Date: Tue, 11 Mar 2003 14:24:05 +1300
> >
> > > At 4:48 PM 3/10/03, Toyota Supra wrote:
> > > >stand alones are a pain in the ass, and its some people choice to
avoid
> > > >such, especially on a daily driver, other people like it, some 
> > > >don't.
> > > >
> > > >what is the bit processing power of the 565/566 processor? from a
quick
> > > >google search, i have found it to be 16 bit, is that correct?
> > >
> > > Hardly. It's at least a 32 bit, if not a 64. Power PC, RISC type.
> > >
> > > Dwarfs anything oem.
> >
> >Don't go too far overboard, it's a 32bit processor, running at 40MHz 
> >(or 56MHz).  It uses the PowerPC type architecture, and includes a 
> >floating point unit (from what I recall :s )
> >
> >It does however dwarf the old model OEM ECU's.  It's being touted by 
> >Motorola as the new device to use for ECU's however :)  So OEM's will 
> >be designing with them as well :) just not to the same level of 
> >integration.
> >
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>
>
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