Hi Bob.

I think you must be very quick on the 4th button to exit (less that 250ms plus the debug delay). If you hold the button longer the ISR will activate again,won't it?

Also the:

@ INT_CLEAR RBC_INT
@ INT_ENABLE RBC_INT

at the end of the ISR are not necessary as they are handled by the DT_Ints, right?

Ioannis