How to use internal oscilator of PIC16F628A?

Hi all,
I want to know how to use internal oscilator of PIC16F628A,the 4Mhz crystal oscilator?Which comand should I use to turn on the internal oscilator,I use PBP and MCS 2.60!
Thanks

I used something like this :

Code:

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@ DEVICE pic16F628A, INTRC_OSC, WDT_OFF, PWRT_OFF, BOD_OFF, MCLR_ON, LVP_OFF

DEFINE  OSC 4

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http://www.picbasic.co.uk/forum/showthread.php?t=543

how about the PCON register?Can I write PCON = $xx and to turn on the internal oscilator?

I don't think so, you want to specify the right one at the beginning. Some 18F allow to switch over the internal to external on the fly (or in case of a external clock fail), but I'm pretty confident you can't do it with grand'pa 16f628.

Quote:

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Originally Posted by fratello

I used something like this :

Code:

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@ DEVICE pic16F628A, INTRC_OSC, WDT_OFF, PWRT_OFF, BOD_OFF, MCLR_ON, LVP_OFF

DEFINE  OSC 4

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I'm stuck on a very similar (i think!) problem;

Using a PIC16F777 for the first time, which has an internal Osc. I'd like to get it running at 4MHz, but using fratello's DEFINE code modified to:

Code:

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@ DEVICE pic16F777, INTRC_OSC

DEFINE  OSC 4

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....as does not work. the 4MHz, seems much more like 4Hz.

Any help?! thanx!

Open the datasheet under OSCCON register, and see the default setting., from there change it.

Thank you Steve - got it working... but i do not understand all the bits in that register;

IOFS: INTOSC Frequency Stable bit ?
SCS<1:0>: Oscillator Mode Select bits ?