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'PIC 16F877 Background Debugger Mode'
1999\06\21@111714 by Craig Bladow

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Can anyone explain how this is implemented?  I haven't found an
explanation in Microchip's documentation except where the bit is set in
the configuration word to enable this mode.

I would guess that a breakpoint register is loaded in a similar manner
as programming is done but what is the command and what address is
jumped to when the breakpoint is hit?

Craig Bladow


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1999\06\21@113154 by Andy Kunz

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>I would guess that a breakpoint register is loaded in a similar manner
>as programming is done but what is the command and what address is
>jumped to when the breakpoint is hit?

You need to ask for the DOS for the chip.

Andy
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1999\06\21@144013 by Howard McGinnis

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At 08:16 AM 6/21/99 -0700, you wrote:
>Can anyone explain how this is implemented?  I haven't found an
>explanation in Microchip's documentation except where the bit is set in
>the configuration word to enable this mode.

The 877 manual touches it briefly in 12.14 In-Circuit Debugger. At the
seminar, and confirmed by the manual, a portion of memory from 1f00 to 1fff
is reserved for the breakpoint handler and interface to the ICD components.

I couldn't find any references to how the address for the breakpoint is
set, but there sure seems to be a lot of unused and reserved registers....

Howard
Howard McGinnis
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