12F508 OPTION Register

[Agent36]

Hi,
Looks like you need to resort to a bit of assembly to get to it.
Now, I truly suck at assembly but if I were to try anything it would probably be something like:

ASM
MOVLW 128   ; Put 128 in W (enable weel pullup).
OPTION         ; Move content of W to OPTION
ENDASM

/Henrik.

Thanks Henrick, that assembly code helped me out with the 12f508. You have to TAB in once then write the code to remove errors.
GPIO.2 and 3 work fine now. Cheers Nick

[Meriachee]

Is this the same kind of process that might be used to get the TOCKI on Portc.5 to be used as a gpio? Any ideas?
The datasheet says:
On power-up, TOCKI functionality is enabled in the OPTION register and must be disabled to allow RC5 to be used as general purpose I/O.
However, noplace does it state how to do that.

[Meriachee]

p.s.
That's on the 16f505 chip, not the 508

[Darrel Taylor]

The OPTION register is accessed the same as any other 16F. PBP translates it to an assembly OPTION command on 12-bit cores.

To use RC5 as an output pin, use ...

OPTION_REG.5 = 0

[Meriachee]

Thanks Darrell, worked like a charm. Options are not so clear in the documentation.