How can I use the rom till the last word?

[vos]

Hi,

I'm working with a Pic10F202 with 512 words Rom and the PCW IDE version 4.030.
I wrote a program that uses 95% or 485 word of the ROM. If I add just one instruction more (i.e. a NOP (delay_cycles(1);)) and compile the program again. I get a ERROR 71 (out of ROM) with the addition: Seg 0-1FF, 181 left, need 182.

0x181 (385 words) thats the size of my main() routine.
I have #separate used for every function. But so far I understand #separate, it won't help because the 10F202 has only one memory bank with 512 words.

I tried for test also to add one NOP within the other function but the result was always the same.

If I analyse the hex-code of the working program with the PicKit 2 Programmer, are there still 17 words unused. In the head of the .lst file of the same program it is written free segment is 27 . That would be again 10 words more.

To finish my application I need now just 4 more assembler instructions. And the analyse has shown that this space exist.

But how can I use the ROM till the last word without a compiler error?

[rnielsen]

The memory space, inside of the PIC, is divided into what's called 'Pages'. These are individual sections of memory that are not connected to each other. The code is 'stuffed' into these pages. The problem is that a routine needs to be contained in One page and cannot bridge over to another page. The compiler might state that you have 95% of the memory used but that's Total memory. You might have 1% in one bank, 3.5% in another bank and so on....

The trouble is figuring out where most of your space is located and trying to move things around to fit everything. I had a project, once, that I had to streamline for the same error. If I put just one extra statement in it, it would puke.

Good luck

Ronald