(tag added)
Peter

On Sat, 2 Jun 2007 12:54:31 +0200, Peter Feucht wrote:

> Dear Piccers,
> 
> Tried to operate a F628A with a 4MHz resonator at 3V 
yesterday - resonator
> shows 4MHz sine wave but processor never starts. Tried 
both XT and HS
> oscillator setup. Data sheet of 628A says Vdd=3-5,5V. After 
changing voltage
> regulator to 5V it works perfectly. 
> 
> Any idea how I can operate this configuration at 3V?

Is this a two-pin or three-pin resonator?  If the former, what 
value of capacitors are you using?

Cheers,


Howard Winter
St.Albans, England


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