Setting Configuration Bits on a PIC12F508

dahli.llama · Joined: 26 May 2005 Posts: 5

Hello,

I need some help setting the configuration bits in the hex file on the PIC12F508. I am using the CCS C compiler for this and the #fuses directive that is supposed to set the correct bits for the configuration. I can get the device to work program correctly using MPLAB IDE and modifying the Oscillator to INTOSC configuration bit in the Configure menu, but no matter what I do using the #fuses directive, I cannot tell any other programmers to set that option correctly.

I am working with another group that only has access to the Baseline Flash Programmer, and that does not have the ability to manually change the configuration bits. When I load my .hex file with that, I get an incorrect configuration word, and these settings are not correctly programmed.

Can anyone give me any help on this matter?

Thanks.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

1. Post your #fuses statement.

2. Compile a program with that #fuses statement, and then post the
last few lines of the HEX file that is created by the compiler.
These lines will contain the fuses settings. The HEX file will be
in your project folder.

3. Post your version of the compiler.

dahli.llama · Joined: 26 May 2005 Posts: 5

1. Ok, the #fuses statement I am using is:

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Hex files use byte addresses, so 0x05FE translates to 0x02FF.
That's wrong. The correct address of the Config Word is 0x03FF
for the 12F508, so it should be 0x07FE in the Hex file. I think
somebody at CCS probably just typed in the wrong value.

If you have PCW or PCWH, you can run the Device Editor, and
see if there is a entry for the Config Word address. If so, you
could fix the problem. If not, you could report the problem to
CCS and wait for a new compiler version, or you could get a
Hex file editor and fix it yourself.

Here's one Hex file editor. I haven't tried it.
http://www.betarun.com/Pages/HexEditor/

dahli.llama · Joined: 26 May 2005 Posts: 5

Thank you for the information.

I will be submitting a bug to them.

I will probably just use the hex editor for now.

Thanks again for the help.

dahli.llama · Joined: 26 May 2005 Posts: 5

Ok, I have tried to manually edit the hex file, but no such luck.

I have changed the end of the .hex file to this:

dahli.llama · Joined: 26 May 2005 Posts: 5

Ok, another thing. I just found this in the PIC12F508/12F509 Memory Programing Specification.

dahli.llama · Joined: 26 May 2005 Posts: 5

Okay, I've solved it!!!

this is what the end of my hex file looks like:

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

OK, I didn't read that part. I just looked at the chart that shows
the physical address. Normally that works.