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RTOS/TDA2HG: Sys/Bios "External Exception"

Part Number: TDA2HG
Other Parts Discussed in Thread: SYSBIOS

Tool/software: TI-RTOS

Sys/Bios offers the ability to attach exception handlers to both "internal" and "external" exceptions:

var Exception = xdc.useModule('ti.sysbios.family.c64p.Exception');
Exception.internalHook = "&MyInternalExceptionHandler";
Exception.externalHook = "&MyExternalExceptionHandler";

Some documentation here.

What I am wondering is, what is the difference between these two categories of exceptions?  Could someone provide an example, in particular, of what constitutes an external exception?

Thanks!

-Matt