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'[PIC]: ER mode PIC16F628'
2002\12\02@134710 by Spehro Pefhany

picon face
Hi, all:-

There does not seem to be any typical or otherwise figures on
clock frequency vs. DC bias resistor on this part. The datasheet
(DS40300B-page 98) refers to the "Electrical Specification"
section, which doesn't seem to have anything in it, only min/max
frequency numbers with no indication of what resistances would
be required to produce those frequencies.

Anyone have even one data point for this? Eg. with a 100K
resistor, I get XX MHz clock.

(There are also a couple of mistakes/omissions on the Pinout
description overview (page 11), none of which have made their
way to the errata yet.)

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
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Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2002\12\02@163040 by Wouter van Ooijen

face picon face
> Anyone have even one data point for this? Eg. with a 100K
> resistor, I get XX MHz clock.

http://www.voti.nl/fader/

As noted on the page, I got the info from the PIClist :)

Wouter van Ooijen

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2002\12\02@165425 by Jinx

face picon face
> There does not seem to be any typical or otherwise figures on
> clock frequency vs. DC bias resistor on this part. The datasheet
> (DS40300B-page 98) refers to the "Electrical Specification"
> section, which doesn't seem to have anything in it, only min/max
> frequency numbers with no indication of what resistances would
> be required to produce those frequencies.
>
> Anyone have even one data point for this? Eg. with a 100K
> resistor, I get XX MHz clock.

My post, 16th Jan 2002 [PIC]: 16f628 external resistor frequency

These are practical measurements for 16F628-04

  R        Clkout * 4

 2k7    9.40MHz
 3k3    9.35
 4k7    9.23
10k     8.44
22k    5.65
 39k    3.50
100k    1.52
220k    0.75 MHz
470k    0.393
 1M     0.192
1M5     0.124
2M2     85,600 Hz
5M6     36,400
12M     16,400

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2002\12\02@172047 by Spehro Pefhany

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At 10:54 AM 12/3/02 +1300, you wrote:

Thanks a bunch Jinx, and Wouter for mentioning it. Just what's required.

;-)

{Quote hidden}

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
EraseMEspeffspam_OUTspamTakeThisOuTinterlog.com             Info for manufacturers: http://www.trexon.com
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2002\12\02@185417 by Andy Kunz

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>(There are also a couple of mistakes/omissions on the Pinout
>description overview (page 11), none of which have made their
>way to the errata yet.)

Such as?

I'm using the '627 and aside from the published Errata I had no problems.
I'm using INTRC mode with RA6 I/O.

This chip is just a couple years late for me - we had requested it from
MCHIP about 4 years ago, and ended up designing around a '558 with some
lower throughput.

Andy

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2002\12\02@211303 by Spehro Pefhany

picon face
At 06:41 PM 12/2/02 -0500, you wrote:
> >(There are also a couple of mistakes/omissions on the Pinout
> >description overview (page 11), none of which have made their
> >way to the errata yet.)
>
>Such as?

Probably would only catch newbies, but since a lot of such use
this chip first, I'll mention them:

1)      The fact RA4 is open-drain only when used as an output is not
        mentioned on Page 11, whereas it is on, say the 16F876.

        16F62x: Bi-directional I/O port/Can be configured as
T0CKI/comparator output

        16F87x: RA4 can also be the clock input to the Timer0 module.
Output is open drain type.

2)      RA6/OSC2/CLKOUT description says:

        Bi-directional I/O port/Oscillator crystal output. Connects to
crystal or resonator in crystal
        oscillator mode. In ER mode, OSC2 pin outputs CLKOUT which has 1/4
the frequency
        of OSC1, and denotes the instruction cycle rate.

        When this is actually optional behavior, so RA6 can be used for
general
        purpose I/O while using ER mode (there are two ER modes, with and
        without clock/4 output on RA6).

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
KILLspamspeffKILLspamspaminterlog.com             Info for manufacturers: http://www.trexon.com
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2002\12\02@214942 by Andy Kunz

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>1)      The fact RA4 is open-drain only when used as an output is not
>         mentioned on Page 11, whereas it is on, say the 16F876.
>
>         16F62x: Bi-directional I/O port/Can be configured as
>T0CKI/comparator output
>
>         16F87x: RA4 can also be the clock input to the Timer0 module.
>Output is open drain type.
>

OK, but that's pretty much a given with PICs.  RA4 = O/C.

{Quote hidden}

It can also be that way for two IRC modes.

Thanks for clearing it up.  I thought it was something new.

Andy

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