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Lpc2000

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Re: [lpc2000] Debugging from Reset (was Re: destroyed LPC2138 via software)

2005-10-26 by Michael Johnson

It would be useful to put words of this form somewhere into the user manual.

Thanks for the clarification.
Michael

>The Philips ARM7 implementation can not be debugged through Reset for 
>a very simple reason, it is called code security.
>
>At reset, all debug channels are disabled to ensure that nobody can 
>break into the chip. Then the code security memory cells are 
>evaluated. If security is not desired by the programmer, the debug 
>options are enabled. 
>
>If Debug options would not be disabled in the beginning, there would 
>be a time window that can be used to force entry into the device. 
>
>ARM7TDMI, the core itself could be debugged from reset, correct but we 
>prefer a higher security over minor restriction for debugging. 
>
>Robert
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