[Diy_efi] Re: Kit

[fuelogic at ihug.com.au]

>What processor is this running on? It looks like a motorola type of assembly
>programming(68HC11 i worked on looked exactly the same)
Twin 68HC912. You are looking at the main program of chip 1.

>So you used 2 CPU12 just to have more I/Os
>and timer, isn't it ? Or do you really need computing power of both CPUs
Yeah...i chose twin CPU12s because

1. I used to use 68HC11 to which CPU12s are code portable
2. I was happy with the 8 MHz clock frequency for chip 1. Chip 2 is mostly
a slave to distribute the coil charge pulses in DFI fashion, run injectors and 
talk to wide band 02
3. I wanted about 14 10-bit AD inputs. Each '12 has 8 10-bit ADs
4. I wanted 12 output compare timers for sequential and DFI V8s
5. I can solder the QFP package myself

>What's the CPU12 clock freq ?
I found the 8 MHz chip ran the main program in about 450 uS...which was all 
the power I felt I needed. Chip 2 runs at 4 MHz. It runs on the clock out of 
chip 1, which is divided by 2.

>Is there an SPI link between both cores ?
Nah...a parallel link that passes 16 bytes of critical data back and forward 
every 16 ms. Fuel amount is passed every 2 ms.

>Are you using the (almost) the same design in your other SPARKDOG
products?
Yeah..only use the CPU12...Matt




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