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68HC11 clocks

 
 
Jeff Fox
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      04-05-2004, 08:03 PM
In some literature about the 68HC11 I see a reference to an 8Mhz
crystal and a 2MHz eClock. Instructions execute in a given number
of clock cycles, but which clock?

Best Wishes,
Jeff Fox
 
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James Beck
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      04-05-2004, 08:36 PM
In article <(E-Mail Removed) >,
(E-Mail Removed) says...
> In some literature about the 68HC11 I see a reference to an 8Mhz
> crystal and a 2MHz eClock. Instructions execute in a given number
> of clock cycles, but which clock?
>
> Best Wishes,
> Jeff Fox
>

Either, it just takes 4 more OSC clock ticks more than E clock ticks

But seriously.....
Most of the documentation refers to E clock cycles.

 
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YB
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      04-06-2004, 06:44 AM
Hi,
The external frequency clock (8MHz for example) is four times the internal
clock (2MHz). So, your instructions are executed with internal clock, 2MHz
(500ns / cycle).

Regards,

Yvan
http://www.ybdesign.fr




"Jeff Fox" <(E-Mail Removed)> a écrit dans le message de news:
(E-Mail Removed)...
> In some literature about the 68HC11 I see a reference to an 8Mhz
> crystal and a 2MHz eClock. Instructions execute in a given number
> of clock cycles, but which clock?
>
> Best Wishes,
> Jeff Fox



 
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