[Diy_efi] oopic2 based controller

[huw scourfield]

16f877 runs at 5Mhz, which gives 0.2 microseconds per "step", no problem
with resolution there. Memory and timers also are not a problem, but the
lack of maths functions are a bit of a pain. Hence interpolation and 16 bit
calculations are not easy!
    Huw
----- Original Message -----
From: "William Shurvinton" <shurvinton at orange.net>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, August 20, 2002 9:29 PM
Subject: Re: [Diy_efi] oopic2 based controller


> Don't take this the wrong way, but you need to do some sums on what you
are
> trying to achieve before you select the PIC to use.
>
> Viz: If you are not sure on the resolution requirements you can't work out
> what timing you need and you can't decide if the MCU is the right one.
>
> Example. You want 1° spark resolution at 8000RPM. 360° is 7.5ms. So 1° is
> 20uS. So your timers must be capable of working to that resolution.
>
> Also look carefully at memory 16 by 16 tables eat 256 bytes of memory if
you
> are running 8 but resolution. Pics are cheap, but have limited memory. You
> can add serial EEPROM, but then you need more code.
> ----- Original Message -----
> From: Bino Lardo <binolardo at hotmail.com>
> To: <diy_efi at diy-efi.org>
> Sent: Tuesday, August 20, 2002 2:04 PM
> Subject: RE: [Diy_efi] oopic2 based controller
>
>
> > its sequentiel,dont know about the injector or spark resolution(what is
> > that),map size 16by16,dis,map sensor,turbo,8000rpm red line,the traction
> > control is not important.
> >
> > I think im gone used a pic16f877 device if some one see something rong
> whit
> > this let me know
> >
> >
>
http://www.microchip.com/1010/pline/picmicro/category/embctrl/14kbytes/devic
> es/16f877/index.htm
> >
>
>
>
>
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