> Was wondering if someone could help me understand how to calculate the timing of
> these 2 signals from the 6809.
> Assuming the external crystal is set to drive the 6809 @ 8Mhz (which i believe
> is the top speed the chip can go - on the 68B09), what would the frequency of
> the E & Q lines be?
> The hardware i'm looking at uses E to pulse a 4020 counter which eventually
> toggles the FIRQ of the 6809, and obviously I'm trying to calculate the correct
> freq. to generate the firq.
> I've looked over the 6809 datasheet and just don't really follow it. I've never
> been good with timing in general, and those datasheets are not written to be
> easily understandable unless you already get the concept! :)
> So if someone could explain, not only the answer, but how I could have derived
> the answer from looking at the datasheet, it would be greatly appreciated..