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'PIC16C5X Lowest frequency you can operate it?'
1995\11\12@152322 by NEIL B. GANDLER

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    I am trying to avoid the sleep mode on the PIC16C5X
to avoid extra external harware and the 18ms wake up period.
(In my design it causes a problem). I decided to use a two
speed RC oscillator. How low of a frequency can I operate the
PIC to simulate a sleep mode? Can I operate down to 1KHz with
3V for example to achieve comparable power reduction to sleep
mode? I would appreciate some advice. Thanks

    Neil Gandler

1995\11\12@154644 by Andrew Warren

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NEIL B. GANDLER <spam_OUTV064MB9KTakeThisOuTspamUBVMS.CC.BUFFALO.EDU> wrote:

>Can I operate down to 1KHz with 3V for example to achieve comparable
>power reduction to sleep mode?

Neil:

In general, the PICs can be run all the way down to DC.  However, you
have to make sure that your Rs and Cs stay within the ranges
recommended by Microchip (R between 3K and 100K, C greater than 20 pF).

-Andy

--
Andrew Warren - .....fastfwdKILLspamspam@spam@ix.netcom.com
Fast Forward Engineering, Vista, California

1995\11\15@064421 by Scott Stephens

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>     I am trying to avoid the sleep mode on the PIC16C5X
>to avoid extra external harware and the 18ms wake up period.
>(In my design it causes a problem). I decided to use a two
>speed RC oscillator. How low of a frequency can I operate the
>PIC to simulate a sleep mode? Can I operate down to 1KHz with
>3V for example to achieve comparable power reduction to sleep
>mode? I would appreciate some advice. Thanks
>
>     Neil Gandler
>
Old, gluttonous NMOS processors had internal coupling caps that prevented
slow clock speeds. CMOS processors, like PIC's can be clocked (or not
clocked, rather) as slow as you can push a single-step/4 button. I remember
hearing that driving the clock in the RC mode can result in high power
consumption due to the nature of the RC oscillator, so it may matter if you
push or pull on the clock pin when 'asleep' and what value resistance is
used. Watch those unused inputs, they suck when they toggle - and can sense
your presense (your 60Hz aura).

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