8-bit MicrocontrollersのトピックRe: BackGround Debug Commands

BackGround Debug Commands

Alice — Fri, 02 Feb 2007 12:16:34 GMT

Hi,
I am using HCS08 Microcontroller with Code Warrior IDE and P&E USB Multilink.
I want to set block protection for my controller using FPROT Register. The datasheet
says that this can be done only using BackGround Debug Commands. I am Unable to figure out how to send these commands. I could not see any option in the IDE through which these cammands can be sent.
Also, How to write the application for backdoor Key access to unsecure the microcontroller.
Thanks and Regards,
Alice..

Re: BackGround Debug Commands

P_EMark — Fri, 02 Feb 2007 23:51:48 GMT

Alice:

When you use the debugger to modify memory, this is effectively a "Background Debug Command" (the debugger would use the BDM Command "write_byte" to modify the memory appropriately).

Therefore, from the debugger, you should be able to modify these registers simply by attempting to write from them from the memory window (not from code executing on the part itself).

Regards,
Mark
P&E

Re: BackGround Debug Commands

prashanterande — Tue, 07 Feb 2012 19:45:57 GMT

Hi mark,

My self prashant.

I m using gt16a, I have same problem. The fprot register only write in debug mode.

How we can enter in debug mode and how to write?

plz help me!!!!

Re: BackGround Debug Commands

bigmac — Tue, 07 Feb 2012 22:39:21 GMT

Hello,

Not sure whether you require to initialize the block protection from within your code, or need to alter the block protection value within a debug session. I will assume that you actually require to initialize block protection.

The value within the NVPROT flash register is automatically written to the FPROT register during a reset. This means that you need to program the NVPROT setting, at the same time as your project code. The assembly code to accomplish this:

ORG NVPROT

DC.B <value>

For C, the following should work with the CW compiler -

const byte NVPROT_init @0xFFBD = <value>;

Regards,

Mac