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SubjectSounds suspiciously like a homework question :) *nt* Reply to this message
Posted byBart T.
Posted on08/09/04 11:55 PM



> 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

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Entire Thread
Subject  Posted byPosted On
*E & Q timing on M6809  sellenoff08/09/04 06:15 PM
..Sounds suspiciously like a homework question :) *nt*  Bart T.08/09/04 11:55 PM
..*Re: Sounds suspiciously like a homework question :) *nt*  sellenoff08/10/04 12:22 PM
...*Re: Sounds suspiciously like a homework question :) *nt*  Bart T.08/10/04 09:12 PM
....*Re: Sounds suspiciously like a homework question :) *nt*  sellenoff08/10/04 11:56 PM
...*Re: Sounds suspiciously like a homework question :) *nt*  Riff08/10/04 08:21 PM
....*Re: Sounds suspiciously like a homework question :) *nt*  sellenoff08/10/04 11:53 PM