12F509 doesn't do anything

Hello!

I already had this problem once, but didn't solve it back then but it kept my mind busy so I decided to return to this and solve it, but with no luck.

I cannot make a 12F509 chip to work with internal oscillator (to be honest - I haven't tried external oscillator or another 509) - something goes wrong. I program the chip with Pickit2 incircuit programmer (I use an adapter so its clean) but it doesn't do anything. I can program the same recompiled file into the 12F675 and it works lika a charm. I have tried both - Melabs Assambler and MicroChip's assambler - same thing - nothing. I suspect that during write, programmator changes the config word or something. Maybe the problem is trivial, but I am not an experienced person so I don't know what I am doing wrong. Please turn me to the right direction!

So the code is extremely simple - blinking led (don't laugh - I want to start the chip running at first).

Code:

---

@ __config _IntRC_OSC & _WDT_ON & _MCLRE_OFF & _CP_OFF
 
 DEFINE OSC 4
 Pause 500
 
 Start:
    High GPIO.2
        Pause 1000
    LOW GPIO.2
        Pause 200
    High GPIO.2
        Pause 200
    Low GPIO.2
        Pause 300
    Goto Start
 EnD

---

It compiles with no errors (I told that it runs smoothly on 675)

Thank you!

Try adding ...

Code:

---

OPTION_REG.5 = 0  ; T0CS internal

---

Which gives you back the TRIS bit so you can change GP2 to output.

Nothing changed but thanks anyway!

Update:
Sorry for this silly bothering - I managed to get it running. Seems that the problem was caused by forgetting to comment out config line in the picbabsic include file. But still I am not sure if that was the real problem, because I also initially modified the default include file to use internal RC and to convert MCLR to input but it didn't work. This stays a mystery.