BDM does not response SYNC command.

[Leomost]

Hello All,

I am creating the application to programming MM912H634. BDM working well before I erase all block. After I use BDM command to do erase all block,BDM will not response any command even SYNC command(BKGD LOW for a while) Will wrong BDM command cause no response to SYNC ?  Is the chip secured? no response to SYNC in secured mode?

[pgo]

Dear Leomost,

You haven't really given enough information to allow anyone to help much.

Can you indicate the following:

• What interface are you using (TBDML)?
• What software (Codewarrior)?
• Where and when exactly are the errors occurring?
• Have you been able to program this chip previously?
• What is an "erase all block command" ?

As a general answer.

I'm unsure if TBDML supports that chip.  It does appear to be a reasonably standard HCS12 chip so it should.

The chip being secured has no affect on being able to sync with the chip so it shouldn't result in that message.

If using Codewarrior you can try using the Unsecure command in the Codewarrior debugger.

bye

[Leomost]

Thanks for your attention. Now I found the chip has no 5v output. Before I take the experiment I power the chip by 12v and it generate 5v on its vddx pin but now it's gone. I don't know why.