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using TOD with high external oscillator frequency (DSP56F827)

Started by atid2 February 18, 2003
Hi all,

Does anybody know of a way to use TOD with external oscillator
frequency higher than 6MHz (actually it's 80MHz)with the DSP56F827?

Thank you in advance
Ari Tidhar



TOD input comes from crystal oscillator rather than
PLL. So even PLL stop working, TOD still can count
input pulse from crystal oscillator. If you use
external oscillator, you should run above 6Mhz. But
you must carefully connect your clock on correct pin.
Please see the following comment from Motorola.

"If external clock frequency is greater than 4Mhz and
Time of Day module is in use, Connect clock source to
XTAL and EXTAL must be connected to VDDA/2. Customer
can use resistor divider to get VDDA/2."

Charlie Wu

--- "atid2 <>"
<> wrote:
> Hi all,
>
> Does anybody know of a way to use TOD with external
> oscillator
> frequency higher than 6MHz (actually it's 80MHz)with
> the DSP56F827?
>
> Thank you in advance
> Ari Tidhar


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