How do we use internal oscillator?

[June]

Dear Sir,

I heard PIC got its own internal oscillator also. But when I check the datasheet of PIC16F876 I couldn't find it. Is that because it doesn't has internal oscillator?

Can I know what is the advantages and disadvantages of using internal internal oscillator. I mean besides external oscillator takes extra place, what are the differences. Does PIC16F84 has internal oscillator also?

Finally, may I know in CCS compiler how do we set the program to use internal oscillator?

Thanks for reading...

Regards: June,
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This message was ported from CCS's old forum
Original Post ID: 9786

[Tomi]

<font face="Courier New" size=-1>Not all of PICs have internal oscillator. As I know only the 8-pin PICs (e.g. 12C508/509, 12CE518,519, 12F675, etc. , internal 4MHz oscillator) and the 18-pin 16F62X series (internal 4MHz/37kHz) have internal osc.
No internal osc in 16F84 but you can use 16F627/628 instead of 16F84. It is pin-compatible with 16F84 and has internal 4MHz/37kHz oscillator.

Advantages: cheaper (you don't need any crystal) and saves 2 PIC pins (what is a real advantage using 8-pin PICs )
Disadvantage: it is not as accurate as crystal osc.

Usage:
enter the right option at your #fuses keyword e.g.:

#include <12ce519.h>
#fuses INTRC,WDT,PROTECT,NOMCLR // INTRC to use 4MHz internal osc.

:=Dear Sir,
:=
:= I heard PIC got its own internal oscillator also. But when I check the datasheet of PIC16F876 I couldn't find it. Is that because it doesn't has internal oscillator?
:=
:= Can I know what is the advantages and disadvantages of using internal internal oscillator. I mean besides external oscillator takes extra place, what are the differences. Does PIC16F84 has internal oscillator also?
:=
:= Finally, may I know in CCS compiler how do we set the program to use internal oscillator?
:=
:= Thanks for reading...
:=
:=Regards: June,</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 9790