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What does BDM stand for?

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What does BDM stand for?

(a) background debug mode

(b) basic debug mode

(c) basic debug microcode

(d) background decode mode

I had been asked this question in a national level competition.

The question is from Emulation Techniques in section Emulation and Debugging Techniques of Embedded Systems

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Correct choice is (a) background debug mode

To explain: The BDM or background debug mode is similar to the on-chip emulator with a slight difference. BDM is provided on the Motorola MC683xx series of processors and for the 8-bit microcontroller like MC68HC12 etc.

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