Background Debug Mode Interface
Background Debug Mode (BDM) interface is an electronic interface that allows debugging of embedded systems. Specifically, it provides in-circuit debugging functionality in microcontrollers. It requires a single wire and specialized electronics in the system being debugged. It appears in many Freescale Semiconductor products.
The interface allows a Host to manage and query a Target. Specialized hardware is required in the target device. No special hardware is required in the host; a simple bi-directional I/O pin is sufficient.
Other articles related to "background debug mode interface, background":
... take control of the target part, stop program execution, and begin operating in Background Mode ...