Error in Program Memory 0800h

[Nwurma]

Hello,
I'm from Switzerland and my English isn't very well, so sorry about that

I think i have a problem with a function which is too big for the program memory of the 16F877.
When i program the pic using IC-Prog 1.05D, it gives me always a error (when i test the code on the pic) at the program memory address 0800h, this is the first address of the 2nd Page of the program memory.

I've read in the forum that its helpful to use the #SEPARATE command, but for me it doesn't work better with this command..

So,have someone a hint for me?

Greetings

Nwurma

p.s.

maybe the absolute listing is helpful:

CCS PCM C Compiler, Version 3.045, 7671

Filename: C:\C\IPA\IPA.LST

ROM used: 5108 (62%)
Largest free fragment is 2048
RAM used: 78 (45%) at main() level
109 (62%) worst case
Stack: 12 worst case (6 in main + 6 for interrupts)

[valemike]

Did you also add on the top of your .c file:

#device *=16

These 16F devices seem to need the above statement as well as

#separate
my_fxn(void); // function prototype

....

#separate
my_fxn(void)
{
// function implementation
}

[nwurma]

thanks for the fast answer,
but it doesnt help..i have always a bug in the 1stor sometime in the 2nd memory Page (0800h odr 1000h), have you any idea what this could be?

greetings

[Guest]

[Nwurma]

hmmm somewhere i've read that its no problem to need 12 stacks if they are distributed in normal and interrupt stack. Maybe this information was wrong

For the 2nd part, not the program get lost, normaly its 1 Byte who is wrong (when i read it out with ic prog) but at times its that after this point ( 0800h or 1000h ) there is also no more text in the Memory Page..

[valemike]

Go grab an 18F442 (or 452 or 4525 or 4520).

Then all you have to worry about now is just your program's functionality.

Also, you should upgrade your compiler version to the most current one, and see what happens.

[Ttelmah]

Seperate 'interrupt' stacks exist on some processors, but not on the PIC. Going beyond 8 deep, will stop the program working.
Seperately, your problem sounds like either a faulty chip, or a problem with the programmer. I have seen similar faults with some devices in the past.

Best Wishes

[PCM programmer]

[nwurma]

Thank you for the good answers..i've minimized my funktions..some were big ( those for the menu ) and so, know I have 8 stack levels and it works fine on the 16F877, but i've already ordered the 18F452 and for the rest of the project i will work with this microcontroller, although thanks for the good tipps and interesting answers!

Best wishes

nwurma

[nwurma]

ehm a new question..for the pic18f452 i need a new compiler? or is it an entry which i have to do..for changing from the 16f877 to the 18f452?

greetings