16F628A and 37 KHZ internal clock

[Pimentel]

Look Henrik,
14.3 Special Feature: Dual Speed
Oscillator Modes
A software programmable Dual Speed Oscillator mode
is provided when the PIC16F62X is configured in either
ER or INTRC Oscillator modes. This feature allows
users to dynamically toggle the oscillator speed
between 4 MHz and 37 kHz. In ER mode, the 4 MHz
setting will vary depending on the value of the external
resistor. Also in ER mode, the 37 kHz operation is fixed
and does not vary with resistor value. Applications that
require low current power savings, but cannot tolerate
putting the part into SLEEP, may use this mode.
The OSCF bit in the PCON register is used to control
Dual Speed mode. See Section 3.2.2.6, Register 3-4.

And Archangel, I will test it, thanks!

[HenrikOlsson]

Hi,
But that's the thing. You're quoting "the same" paragraph of the datasheet as I was but in "your" datasheet it says 37kHz, while in "mine" it says 48kHz. One of them is wrong or they've changed the silicon (unlikely). I'm not saying mine's correct and your's wrong (actually perhaps I am....) just that there is an inconsistency and that the 37kHz you might think you're running at might not be 37kHz.

The one I'm reading is called DS40044F and is dated 2007. Is it possible that you're looking at either an old version (prior to revision C is my guess) of the datasheet OR perhaps a version for the 16F628 (non A version?)

Anyway, good luck with the project!

/Henrik.

[Pimentel]

Hi Henrik,

Thanks for your help.
I solved the problem using internal OSC config ( the noise finished using 37/48KHZ or 4 MHZ).
I don't remember where I downloaded the datasheet, but I perceved that was very slow speed. Maybe was 16f628 as you said.
Thank you again my friend.