Searching \ for '[PIC]: PIC Processor with several internal osc' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/microchip/time.htm?key=osc
Search entire site for: 'PIC Processor with several internal osc'.

No exact or substring matches. trying for part
PICList Thread
'[PIC]: PIC Processor with several internal oscill'
2007\02\14@163159 by PAUL James

picon face
All,

It seems to me I have seen a PIC that has several internal RC Osc
frequencies available just by giving the correct configuration bits.
I seem to remember there being maybe 5 or 6 frequencies that started at
30Khz and went to maybe 8 or 10 Mhz.
But now for the life of me I can't seem to find it.   Does anyone here
have any ideas as to a part like this?   Or am I halucinating?

Someone let me know please.




Thanks and Regards,


Jim

'[PIC]: PIC Processor with several internal oscilla'
2007\02\14@164507 by Chris McSweeny

picon face
The 12f683 does - I presume there must be others, but that's the one I have
knowledge of. A choice of 31kHz or 125kHz to 8MHz in 3dB steps. Not
something you can set with config bits though - you need to write to the
OSCCON register in software, and it will always start at 4MHz after a reset.

On 2/14/07, PAUL James <spam_OUTJames.PaulTakeThisOuTspamcolibrys.com> wrote:
{Quote hidden}

> -

2007\02\14@165459 by Marcel Birthelmer

picon face
16F88 has an intosc that goes from about 32khz (RC) to 8MHz, using
configuration bits and the OSCCON register. I think this is identical
to most other parts, though a lot of them also don't go beyond 4MHz by
themselves.
- Marcel

On 2/14/07, Chris McSweeny <.....cpmcsweenyKILLspamspam@spam@gmail.com> wrote:
{Quote hidden}

2007\02\14@165528 by William Bross

picon face
PAUL James wrote:

>All,
>
>It seems to me I have seen a PIC that has several internal RC Osc
>frequencies available just by giving the correct configuration bits.
>I seem to remember there being maybe 5 or 6 frequencies that started at
>30Khz and went to maybe 8 or 10 Mhz.
>But now for the life of me I can't seem to find it.   Does anyone here
>have any ideas as to a part like this?   Or am I halucinating?
>
>Someone let me know please.
>
>
>
>
>Thanks and Regards,
>
>
>Jim
>  
>
Jim,

The PIC16F690 and its associated series has the LFINTOSC that runs at
8mhz and has a postscaler to run it at 4/2/1mhz 500/250/125khz and
31khz.  If you do a site search and key off LFINTOSC you'll get the list
of processors that support this option.

Bill

2007\02\14@165904 by Jan-Erik Söderholm

face picon face
*Any* Nanowatt part.

Usualy 32 Khz -> 8 Mhz, sometimes including
16/32 Mhz when using the 4xPLL with the INTOSC...

Jan-Erik.




PAUL James skrev:
{Quote hidden}

2007\02\14@170422 by Marcel duchamp

picon face
'f88's and associated family have this.

Chris McSweeny wrote:
> The 12f683 does - I presume there must be others, but that's the one I have
> knowledge of. A choice of 31kHz or 125kHz to 8MHz in 3dB steps. Not
> something you can set with config bits though - you need to write to the
> OSCCON register in software, and it will always start at 4MHz after a reset.
>
> On 2/14/07, PAUL James <.....James.PaulKILLspamspam.....colibrys.com> wrote:
>> All,
>>
>> It seems to me I have seen a PIC that has several internal RC Osc
>> frequencies available just by giving the correct configuration bits.
>> I seem to remember there being maybe 5 or 6 frequencies that started at
>> 30Khz and went to maybe 8 or 10 Mhz.
>> But now for the life of me I can't seem to find it.   Does anyone here
>> have any ideas as to a part like this?   Or am I halucinating?
>>
>> Someone let me know please.


2007\02\14@173127 by Jan-Erik Söderholm

face picon face
Why does everyone mention specific part numbers ?
Look for 8 Mhz intosc (or "nanowatt")in the
parametric search on http://www.microchip.com instead.

It would be a *lot* of posts if one would make
one post for each nanowatt device...

Regards,
Jan-Erik.

2007\02\14@182402 by Byron A Jeff

face picon face
On Wed, Feb 14, 2007 at 03:31:25PM -0600, PAUL James wrote:
> All,
>  
> It seems to me I have seen a PIC that has several internal RC Osc
> frequencies available just by giving the correct configuration bits.
> I seem to remember there being maybe 5 or 6 frequencies that started at
> 30Khz and went to maybe 8 or 10 Mhz.
> But now for the life of me I can't seem to find it.   Does anyone here
> have any ideas as to a part like this?   Or am I halucinating?
>  
> Someone let me know please.

You're lucid. That oscillator is part of Microchip's nanowatt package.

This microchip document outlines the facility:

http://ww1.microchip.com/downloads/en/devicedoc/30620a.pdf

The low end is 31.25 kHz. The high end is 8 MHz.

Parts such as the 16F88 and the new 16F887 utilize this package.

Hope this helps,

BAJ

2007\02\15@061413 by Jan-Erik Söderholm

face picon face
Byron A Jeff wrote :

> The low end is 31.25 kHz. The high end is 8 MHz.

High end is 16/32 Mhz on some of the newer PIC18
devices since the 4x PLL can also be used with
INTOSC in 4 and 8 Mhz mode (and not only with
the external crystal oscillator). Real nice...

Jan-Erik.

2007\02\27@204740 by lee

flavicon
face
>It seems to me I have seen a PIC that has several internal RC Osc
>frequencies available just by giving the correct configuration bits.
>I seem to remember there being maybe 5 or 6 frequencies that started at
>30Khz and went to maybe 8 or 10 Mhz.
>But now for the life of me I can't seem to find it.   Does anyone here
>have any ideas as to a part like this?   Or am I halucinating?

Hi Jim
Don't know if this is what you are after, but I know that the PIC18F 2525
/ 2620 / 4525 / 4620 range (and I'm sure others) have both an internal osc
and an internal RC osc, which operate independently and can have their
frequencies changed and updated via code.  The range is from 31kHz to
8MHz, up to 32MHz if PLL is used.
The internal osc sounds like it is a lot more stable than the internal RC
osc.  Don't know if you could completely remove any need for an external
crystal in all circumstances, but it's definitely not RC based, and would
definitely be better than ANY RC osc, internal or external.

That's about all I can tell you, hope it helps
Lee

2007\02\27@211429 by michael brown

picon face
lee@baudalign.com wrote:
>> It seems to me I have seen a PIC that has several internal RC Osc
>> frequencies available just by giving the correct configuration bits.
>> I seem to remember there being maybe 5 or 6 frequencies that started
>> at 30Khz and went to maybe 8 or 10 Mhz.
>> But now for the life of me I can't seem to find it.   Does anyone
>> here have any ideas as to a part like this?   Or am I halucinating?

It's called INTOSC (usually, but not allways) and it runs from 31kHz to
8MHz.  It's accurate to 1% over a narrow voltage and temperature range and
better than 2% over a large operating range.  Allot of the so-called
nano-watt variety PICs have it.  For example, the 16F88 and 12F683.  I'm
sure there are many others, but these are the ones that I use.

2007\02\27@213545 by peter green

flavicon
face

> It's called INTOSC (usually, but not allways) and it runs from 31kHz to
> 8MHz.  It's accurate to 1% over a narrow voltage and temperature
> range and
> better than 2% over a large operating range.
2% would be good enough for RS-232 but nowhere near good enough for any application that needed to track time of day nor for fast communications protocols like USB.

btw looking at the 4620 data sheet it seems you can use the pll with the internal oscilator but only by turning on the PLL in software, i'd imagine this applies to other similar PICs as well.


2007\02\28@043901 by Jan-Erik Söderholm

face picon face
A *few* of the *newest* 18F's can combine the 4xPLL with
the INTOSC (in 4 or 8 Mhz mode) for an effective speed
of 16 or 32 Mhz. The older/first "nanoWatt" modells that
used the 8 Mhz INTOSC can not do this.

Unfortunaly this feature is not "filterable" using the
parametric search tool, you have to check each data sheet...

Jan-Erik.


peter green skrev:
>> It's called INTOSC (usually, but not allways) and it runs from 31kHz to
>> 8MHz.  It's accurate to 1% over a narrow voltage and temperature
>> range and
>> better than 2% over a large operating range.
> 2% would be good enough for RS-232 but nowhere near good enough for any application that needed to track time of day nor for fast communications protocols like USB.
>
> btw looking at the 4620 data sheet it seems you can use the pll with the internal oscilator but only by turning on the PLL in software, i'd imagine this applies to other similar PICs as well.
>
>

2007\02\28@044058 by Jan-Erik Söderholm

face picon face
lee@baudalign.com wrote :

> Don't know if this is what you are after, but I know that the PIC18F 2525
> / 2620 / 4525 / 4620 range (and I'm sure others) have both an internal osc
> and an internal RC osc, which operate independently and can have their
> frequencies changed and updated via code.  The range is from 31kHz to
> 8MHz, up to 32MHz if PLL is used.

The INTRC (used by the WDT and other) is *not* adjustable. It's a fixed
32 Khz osc. The INTOSC has software selectable speeds.

Jan-Erik.

More... (looser matching)
- Last day of these posts
- In 2007 , 2008 only
- Today
- New search...