Internal RC with IO on PIC16F877A

[alagee]

Hi
can anyone help me find a way to choose the #FUSE for using internal RC on PIC16F877A with OCS pins as IO?

#fuses INTRC_IO
and
#fuses INTRC

do not work!

[temtronic]

Going from memory( 2 DECADES ago...), that PIC does NOT have an internal Oscillator.
probably explains why those 'fuses' don't work for you.

You either use a xtal/2 caps OR an R/C configuration, with clk out being F/4

Again from memory.....
The datasheet. 'special functions of the CPU. chapter ???

Jay

[Ttelmah]

Exactly right Jay.

The four oscillators are:
RC
HS
XT
LP

The RC one is using an external resistor/capacitor, not an internal oscillator.
The watchdog has it's own internal oscillator, but the CPU doesn't.

There are pin compatible later chips that do have an internal oscillator, but
the earlier chips generally did not offer this.

[alagee]

I am really grateful to have your support.

there was a misunderstanding in project definition.

The micro must have been PIC16F887 that I included PIC16F877 wrongfully.

the problem is solved.

Thank you all

[Ttelmah]

I think 'oops' officially applies!....

At least you now know 'why' the compiler was refusing to let you select
the internal oscillator.