Thanks to everyone for the information.

----- Original Message -----
From: Bob Barr <bbarr@CALIFORNIA.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, December 02, 2001 2:02 AM
Subject: Re: [PIC] Internal oscilator on 16F627


> On Sun, 2 Dec 2001 11:30:08 +1300, you wrote:
>
> >> any way of setting the internal RC oscilator on 16F627
> >> to its maximum ??
> >
> >The internal RC oscillator is fixed at 4MHz (PCON.3 = 1) or 37kHz
> >PCON.3 = 0). If you're talking about ER (external resistor) mode,
> >there's no chart AFAIK to help set the frequency. Drawing one up
> >is something I'd planned to do in the next day or two. I'll post it, but
> >I have only the -04 parts to hand, the -20 will have to wait
>
> Here are some data points from my 2 16F628-20's:
>
> (Vdd = 5 volts, 68 degrees F, calculated from CLKOUT period)
>
> 4.75K...10.2 MHz.....10.4 MHz (lower R is no faster)
>
> 7.5K......9.2 MHz.....9.5 MHz
>
> 15.4K...7.9 MHz.......8.0 MHz
>
> 28K.....5.4 MHz.....5.5 MHz
>
> (Microchip recommends 38K minimum, DS40300B, page 98, YMMV)
>
> 38K......4.2 MHz.....4.3 MHz
>
> 169K....1.0 MHz....1.1 MHz
>
> 300K....633 KHz....662 KHz
>
> 470K....413 KHz....439 KHz
>
> 1M......196 KHz...211 KHz
>
> (Microchip recommends 1M maximum, DS40300B, page 98, YMMV)
>
> 2.2M....91 KHz...99 KHz
>
> Regards, Bob
>
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