----- Original Message ----- 
From: "Peter Feucht" <p.feucht@palmed-medizintechnik.de>
To: "'Microcontroller discussion list - Public.'" <piclist@mit.edu>
Sent: Saturday, June 02, 2007 6:54 AM
Subject: F628A with resonator at 3V


> 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?
>
> Thanks for any help and best reagrds
>
> Peter
>

Microchip mid-range reference manual shows the 16F series as operating from 
4.5 V to 6 V. It appears you need a 16LF device to be able to operate at 3 
V.

Richard Seriani


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