External interrupt

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Q: Does the C672x DSP have dedicated general-purpose interrupt pins?

The C672x DSP does not have any dedicated GPIO/Interrupt pins. This is different than the C6713 DSP which has up to four external interrupts. This is the reason it is not possible to select an external pin as an interrupt source.

However, the C672x DSP supports external interrupts with dedicated edge detect hardware using the McASP AMUTEIN signals.The AMUTEIN0, AMUTEIN1, and AMUTEIN2 signals can be used to provide external interrupt support. A very short pulse (two SYSCLK2 cycles or more) on these signals will be detected and captured in hardware inside the dMAX accelerator. The dMAX can then be configured to act on these interrupts and/or pass them on to the DSP CPU. There are seven pins from which three can be chosen to map to the AMUTEIN0, AMUTEIN1, and AMUTEIN2 interrupts.

There is an application note you can refer to, please see

http://focus.ti.com/general/docs/techdocsabstract.tsp?abstractName=spraaj3

For more information you can refer the datasheet of C6727B processor C6727B and also refer to the dMAX users guide SPRU795 for additional details.