Embedded Target for Motorola MPC555

Downloading Boot or Application Code via CAN
Without Manual CPU Reset

The default method for download over CAN requires that the target processor be manually reset in order for the download process to begin. This requirement may be problematic if the target hardware is not physically accessible or if it cannot be individually reset or powered down/up.

It is possible to remove this requirement for manual reset if a suitably prepared application is already running on the target. To do this, include a CAN Calibration Protocol block within the model (See CAN Calibration Protocol).

When the currently running application includes the CAN Calibration Protocol block, the download process begins immediately when you click on the Download button of the Download Control Panel; it is not necessary to manually reset the target hardware to initiate the download.

When using the CAN Calibration Protocol block, you must specify

• CAN message identifier for Command Receive Objects
• CAN message identifier for Data Transmit Objects
• Can Calibration Protocol Station Address

Note that the values specified may differ from the default values for these parameters that are programmed in the boot code. When performing the download procedure using the Download Control Panel, you must ensure that the parameters specified on the CAN Options tab match those specified in the currently running application.

For an example of how to use the CAN Calibration Protocol block, see the demo model mpc555rt_ccp.

Downloading Application Code

Boot Code Parameters for CAN Download