User`s manual

You first must set the target speed with the choice 1). After entering the first choice, you

will be prompted to enter the target speed. It’s the crystal frequency, not the bus speed

that is boosted up by the on-chip PLL. After a reset, before the PLL is enabled, the target

MC9S12DG256 is running from the crystal frequency, not the PLL frequency. Enter

16000 for the target speed. After the correct speed is entered, the master will try to

communicate with the target board. If it‘s not successful, enter choice 2) to reset the target

board.

Can't Communicate With Target CPU

1.) Set Target Speed (16000 KHz)

2.) Reset Target

3.) Reattempt Communication

4.) Erase & Unsecure

? 1

Enter Target Crystal Frequency (kHz): 16000

Can't Communicate With Target CPU

1.) Set Target Speed (16000 KHz)

2.) Reset Target

3.) Reattempt Communication

4.) Erase & Unsecure

? 2

When the communication is established, you will see the following sign-on message:

D-Bug12 v4.0.0b32

For Commands type "Help"

You will notice that the debug prompt is “S>” in the POD mode, not just a “>” in the EVB

mode. The S> tells that this is the POD mode and the MC9S12DG256 on target (slave

board) is stopped. Sometimes the prompt could be a “R>” that means the target MCU is

running. If you see the “R>”, just type “reset” then <Enter> to reset the target and it will

come back to the “S>” prompt.

R>Reset <Enter>

Note: The initial communication in POD mode does not always work smoothly and

sometimes the PC screen would only display an incomplete sign-on message. You need

to re-start it all over again by pressing reset buttons on both master board and target

board, then press the Enter key on PC keyboard. You cannot go to the next step until PC

screen shows the prompt ‘s>’.

In order to program the flash memory, you have to erase it by using the FBULK command.

S>fbulk <Enter>

When the prompt “s>” returns, the FBULK command has already erased all of the flash

memory contents of the target MC9S12DG256 including the bootloader. If it returns with a

message “Flash or EEPROM Failed To Erase” the MC9S12DG256 is defective.