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'''Background debug mode''' (BDM) interface is an electronic interface that allows [[debugging]] of [[embedded system]]s. Specifically, it provides [[in-circuit emulator|in-circuit debugging]] functionality in microcontrollers. It requires a single wire and specialized electronics in the system being debugged.
It appears in many [[
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 biidirectional [[I/O port|I/O pin]] is sufficient.
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