AN2104 Freescale Semiconductor, AN2104 Datasheet - Page 2

• Manufacturer Part Number: AN2104
• Description: Using Background Debug Mode
• Manufacturer: Freescale Semiconductor

Application Note
Theory of Operation
2
When the BDM is active, it takes over control of the microprocessor,
which allows for debugging, etc.
Other examples of what the BDM can be used for, besides debugging,
vary from programming EPROM, EEPROM, and FLASH (internal and
external) to performing calibration on a target application (in
manufacturing and in the field) to transferring collected and stored
information to another system.
Because software packages, such as P&E Microcomputer Systems’
Windows Development Package (PKG12), take care of the operation of
the BDM, this discussion does not go into great detail. For more in-depth
information on this subject, refer to the documents referenced in
Technical Resources
The operation of the BDM system requires a host PC with software, a
BDM interface POD or BDM interface, and the user’s target application.
See
parallel cable from the PC’s parallel port. The POD is then connected to
the target application via a custom 6-pin BDM connector and cable. See
Figure
Freescale Semiconductor, Inc.
Figure
For More Information On This Product,
HOST PC
2.
1. The host PC is connected to the POD with a DB-25
Go to: www.freescale.com
PARALLEL
CABLE
at the end of this document.
Figure 1. BDM System
MICROCOMPUTER SYSTEMS
CABLE12 FROM P&E
BDM INTERFACE
INTERFACE POD
CABLE
BDM
6-PIN BDM CONNECTOR
TARGET BOARD
SEE FIGURE 2
AN2104