The BDM handshake pin on the HC12 and HCS12 is a bi-directional timed
interface. If you try to use a pin on a PC to talk to the BDM, you will
not be able to control the timing and directionality with sufficient
accuracy. This iss why most interfaces between a PC and the BDM use
either a small microcontroller or a smart timed logical device.
Regards
Dave Perreault
lenux22 wrote:
>Hello!
>
>Thansks! Info from with site is very usefull! But it all about BDM.
>I also had read AN2104 document (Using Background Debug Mode for the M68HC12
Family Application Note). It contains some info about BDM commands. In
particular there is table with commnad description, which looks like (for
example) COMMAND_NAME ITS_HEX_CODE. It seems very simply to send via BDM
commands READ_BD_WORD/WRITE_BD_WORD... But there is special BDM cable which is
connect to host via lpt or com port. This cable contain a box with
microctroller. Now a question:
>What microcontroller do? Is it need to convert these commands to anothers?
Why i can't send this commnads right to HCS12?
>
>WBR,
> lenux
>--- In , Javier Gorgas <jgorg60@y...> wrote:
>>check out www.allactivex.com
>>
>
>--------------------
>
>">http://docs.yahoo.com/info/terms/
Reply by lenux22●May 28, 20032003-05-28
Hello!
Thansks! Info from with site is very usefull! But it all about BDM.
I also had read AN2104 document (Using Background Debug Mode for the M68HC12
Family Application Note). It contains some info about BDM commands. In
particular there is table with commnad description, which looks like (for
example) COMMAND_NAME ITS_HEX_CODE. It seems very simply to send via BDM
commands READ_BD_WORD/WRITE_BD_WORD... But there is special BDM cable which is
connect to host via lpt or com port. This cable contain a box with
microctroller. Now a question:
What microcontroller do? Is it need to convert these commands to anothers? Why i
can't send this commnads right to HCS12?
WBR,
lenux
--- In , Javier Gorgas <jgorg60@y...> wrote: > check out www.allactivex.com
Reply by Javier Gorgas●May 27, 20032003-05-27
check out www.allactivex.com
lenux22 <> wrote: Hello!
I had a new question about Motorola HCS12.
We had virgin chip without any evalution boards, programming units and other
devices. We suppose that we can make our's own programming device for
HCS12. I think chip has bootrom, which contains code for loading flash by serial
port (SCI). Where to find documentation about message format for load HCS12?
lenux22 <> wrote:Hello!
I had a new question about Motorola HCS12.
We had virgin chip without any evalution boards, programming units and other
devices. We suppose that we can make our's own programming device for
HCS12. I think chip has bootrom, which contains code for loading flash by serial
port (SCI). Where to find documentation about message format for load HCS12?
WBR,
lenux
--------------------
---------------------------------
Reply by lenux22●May 27, 20032003-05-27
Hello!
I had a new question about Motorola HCS12.
We had virgin chip without any evalution boards, programming units and other
devices. We suppose that we can make our's own programming device for
HCS12. I think chip has bootrom, which contains code for loading flash by serial
port (SCI). Where to find documentation about message format for load HCS12?