Stupid simple question.....

[HenrikOlsson]

Nah, if you look at section 9.1 of the mid-range manual you'll find the following:

All write operations (such as BSF and BCF instructions) are read-modify-write operations. Therefore a write to a port implies that the port pins are read, this value is modified, and then written to the port data latch.

So I'll stick to my theory ;-)

[Acetronics2]

Ok Henrik ...

One red tomato for me ... ( was the question ...)

this also explains why it acts the same whith heavy capacitive loads ... driving directly Big Mosfets gates i.e.

Alain

PS: but what an Idea µChip had to proceed like that ???

[chien_fu]

Why is it that when I enter:

GPIO = %11111111

Picbasic says "Undefined variable"?

[HenrikOlsson]

Hi,
Because the variable GPIO isn't defined....

This is because you're using PBC and it doesn't provide a way to directly write to the registers as you're trying to do - only PBP does that. As I wrote in my previous message you need to do as Darrel showed you earlier in the thread:

SYMBOL GPIO = $05     '$05 is derived from the memory map in the datasheet for 12F683
SYMBOL TRISIO = $85

Poke TRISIO, 0   'Set all available GPIO pins as outputs
Poke GPIO, 255  'All availble GPIO pins high.

[chien_fu]

Cool, thanks.