This demo is targeted towards the EVBplus Dragon12-plus board, with 256 kB internal Flash EEPROM and 12 kB internal RAM.

To program the bootloader into the internal flash on the HCS12DG256 microcontroller, the P&E Micro USB BDM Multilink interface was used. However, this is not required if you have another means of programming the internal flash.

To compile the demo programs you can use the Freescale Codewarrior for HCS12(X) development environment.

Before the bootloader can be used, it needs to be built and programmed into the HCS12DG256's internal flash memory. The steps in this section only need to be done once.

When using Freescale Codewarrior, simply open the project from within Codewarrior and select Project→Make from the menu. The project file is located at: \Target\Demo\HCS12_Evbplus_Dragon12p_CodeWarrior\Boot\ide\

The bootloader program is now ready to be programmed into the internal flash memory of the HCS12DG256. Using your favorite programmer, flash the bootloader using one of the following files, depending on what file type your programmer supports:

• \Target\Demo\HCS12_Evbplus_Dragon12p_CodeWarrior\Boot\bin\openblt_evbplus_dragon12p.abs
• \Target\Demo\HCS12_Evbplus_Dragon12p_CodeWarrior\Boot\bin\openblt_evbplus_dragon12p.abs.s19

The Microboot utility needs to be configured to connect to the correct COM-port and to communication at the correct baudrate:

• Start Microboot by double-clicking “\Host\MicroBoot.exe”.
• Click the “Settings”-button and select “OpenBLT using UART” from the dropdown box.
• Click the “Options”-button to configure the communication parameters.
  • Select the PC's COM-port that the board is connected to.
  • Set the baudrate to 57600 bits/sec.

Once you saved the settings by clicking the “OK”-button twice, you can close Microboot by clicking the “Cancel”-button on the main screen. Microboot is now ready for action!

When using Freescale Codewarrior, simply open the project from within Codewarrior and select Project→Make from the menu. The project file is located at: \Target\Demo\HCS12_Evbplus_Dragon12p_CodeWarrior\Prog\ide\

The output file is

• \Target\Demo\HCS12_Evbplus_Dragon12p_CodeWarrior\Prog\bin\demoprog_evbplus_dragon12p.abs.sx

To download this demoprog_evbplus_dragon12p.abs.sx file to the remaining flash memory using the bootloader, start the Microboot program and click the “Browse”-button. Browse to the “\Target\Demo\HCS12_Evbplus_Dragon12p_CodeWarrior\Prog\bin\” directory and select the demoprog_evbplus_dragon12p.abs.sx file to start the download.

Once the download completed, the newly programmed software will be started by the bootloader. You can verify this by checking that an LED blinks. Congratulations! That's all there is to using the bootloader.