I encountered a problem when using ADSP-21161N and VisualDSP++V3.5. In our solution, we used two interrupts, one is the timer (TMHI) and the other is the IRQ2. Interrupt nesting was enabled. All interrupt service routines were defined with the “#pragma interrupt” ahead and connected to the system with a call to “interruptss”. The problem is that the dsp entered a halted state when interrupt nesting occurred, it didn’t respond to anything including interrupts. Why did this happen? Thank you in advance!