Using PC HW

[Woodd, Michael]

I belong to the EFI332 list too, dont worry.  But I came along too late to
really consider getting the setup through the bulk buy-in  -  I missed the
parts buy and I don't know how easy/expensive it would be to get them
any other way.  I have downloaded all the schematics etc, and maybe
later on if I find the 552 has not enough speed then I'll look at it.

My understanding of the 332 is the processor cycle is CLK/2 - is that
correct?  so at 20 MHz, it would be 0.1uS?  Also, what about the TPU
timer resolution?  My problem with the 552 is that for a 16000rpm
motorcycle engine, I don't know if the 552 is fast enough with a CLK/12
processor cycle and timer resolution.  I think it will be for a mapped
4cyl wasted spark ignition system, but not for timed sequential EFI.

Anyhow, for those who expressed an interest in the AN number,
it is Philips AN 418, it is to do with Timer 2 Counter/Timer Capture/
Compare functions etc, but it describes an example of how to use
these 552 features to implement coil and injector timing.  It doesn't
describe any algorithms to calculate these values or anything,
but the simplest system should be easy to implement once I
get used to programming it.  I wont be able to scan it and post it
before I leave my current job on Thursday, sorry!

Mike Woodd
(wooddm at akcity.govt.nz)

>I'll agree 'a car is no place for pc's' It can be done (and is) but why 
make
>extra trouble. On the EFI 332 list you could have had the CPU board and
[snippety snip]
>built in A/D they have a version with that too. But the idea is the same, a
>PC mudder board will be about the worst thing that you could base a system 
on.
>
>Sandy