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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 [[Freescale Semiconductor]] products. Background commands are categorized into two types: Non-intrusive commands and Active background commands. Non-intrusive commands can be issued while the user program is running, which include memory access commands.<ref>{{Cite web |url=https://www.datasheetarchive.com/datasheet?id=a84bd5f4cb577c604e833c56c460f32672f7e4&type=M&term=hcs08rmv1 |title=HCS08 Family Reference Manual |pages=34-35 |accessdate=2024-02-06}}</ref>
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 bidirectional [[I/O port|I/O pin]] is sufficient.
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A good development tool environment is important to reduce total development time and cost. Users want to debug their application program under conditions that imitate the actual setup of their system. Because of that, the capability to debug a user program in an actual target system is required. This is known as [[in-circuit emulator|in-circuit debugging]]. Furthermore, most new MCUs have nonvolatile memory such as [[flash memory]] so that programming code on the target system is also required. This is known as [[In-system programming|in-circuit programming]].
To support in-circuit debugging and programming requirements, the [[HC08]] Family has the monitor mode and the HCS08 and RS08 utilize a background debug mode (BDM). The background debug hardware on the HCS08 consists of a background debug controller (BDC) and debug module (DBG). The background debug hardware on the RS08 consists of the background debug controller (BDC) only.
== BDM commands ==
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== References ==
{{reflist}}
* Freescale Semiconductor Inc. [http://www.freescale.com/files/microcontrollers/doc/ref_manual/CPU12RM.pdf CPU12 Reference Manual]▼
== External links ==
* Freescale Semiconductor Inc. [http://cache.freescale.com/files/microcontrollers/doc/ref_manual/RS08RM.pdf RS08 Core Reference Manual]▼
* Freescale Semiconductor Inc. [
▲* Freescale Semiconductor Inc. [https://web.archive.org/web/20051022211235/http://www.freescale.com/files/microcontrollers/doc/ref_manual/CPU12RM.pdf CPU12 Reference Manual]
* Freescale Semiconductor Inc. [https://hibp.ecse.rpi.edu/courses/CStudio/hc12/CPU12RM.pdf CPU12 Reference Manual]
▲* Freescale Semiconductor Inc. [https://web.archive.org/web/20140309095025/http://cache.freescale.com/files/microcontrollers/doc/ref_manual/RS08RM.pdf RS08 Core Reference Manual]
* Freescale Semiconductor Inc. [https://www.nxp.com/docs/en/reference-manual/RS08RM.pdf RS08 Core Reference Manual]
* Freescale Semiconductor Inc. [https://web.archive.org/web/20120312074607/http://cache.freescale.com/files/microcontrollers/doc/ref_manual/HCS08RMV1.pdf HCS08 Family Reference Manual]
* Freescale Semiconductor Inc. [https://www.datasheetarchive.com/datasheet?id=a84bd5f4cb577c604e833c56c460f32672f7e4&type=M&term=hcs08rmv1 HCS08 Family Reference Manual]
[[Category:Embedded systems]]
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