----- Original Message ----- 
From: "Rikard Bosnjakovic" <rikard.bosnjakovic@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Friday, April 20, 2007 7:23 AM
Subject: Re: [PIC] Oscillator-selection


> Last (I hope) question for this matter.
>
> In the 16F886-dataheet (DS41291-D), page 77, there's a note about
> using the internal oscillator saying "The oscillator requires a
> start-up and stabilization time before use. Thus, T1OSCEN should be
> set and a suitable delay observed prior to enabling Timer1".
>
> The term "suitable delay" does really not tell me anything. Are we
> talking about 2 msec or 2 secs here?  I don't have an oscilloscope
> either so I cannot "observe" the waveform.
>
> Anyhow, if I parse the datasheet correct, I'm supposed to do something
> like this:
>
>        banksel T1CON                           ; Setup Timer1
>        bsf     T1CON, T1OSCEN                  ; Enable internal 
> oscillator
>        bsf     T1CON, TMR1CS                   ; Use external clock
> (built-in 32kHz)
>
>        call    some_nice_delay_thingie
>
>        bsf     T1CON, TMR1ON                   ; Start timer1
>
>
>
> -- 
> - Rikard - http://bos.hack.org/cv/
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>

I'm new to PICs, but maybe the information in Table 17-4 of the datasheet, 
particularly parameter 32 (oscillation start-up timer period) will help?

Good luck.
Richard


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist