How to fill with goto statement ?

jaikumar · Joined: 15 Dec 2006 Posts: 109

Hi all,

I want to fill with GOTO 0x0000 statement after the end of program till the end of program memory.

How can I do this?

thanks and regards,
Jai.

SherpaDoug · Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA

Back in the stone age we used to fill unused ROM with No-Ops so if the PC got there it would just run through them till it hit the reset vector at the top of memory.
I have not heard of anyone doing that in the last 25 years.
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RF_Developer · Joined: 07 Feb 2011 Posts: 839

Ttelmah · Joined: 11 Mar 2010 Posts: 19513

The problem is that a goto, in PIC coding, is not a single word instruction.
CCS provides the instruction #FILL_ROM to put any single instruction into unused memory space if required. By default they put a sleep instruction as the word after the end of memory, and as RF_Developer says, unprogrammed cells will contain a NOP, so if the watchdog is enabled, the sleep will give a reset if you run out of the end of memory, and the NOP's will force a loop back to the bottom of memory if you end up anywhere else.

Best Wishes

jaikumar · Joined: 15 Dec 2006 Posts: 109

Thanks all for the info.

regards,
jai.