> 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.. > > Thanks > Steve >
 Bart
