TI C66x DSP中断类型及其优先级

There are four types of interrupts on the CPU.
• Reset
• Maskable
• Nonmaskable
• Exception（异常也可视为中断）

These first three types are differentiated by their
priorities. The
reset interrupt has the highest priority and corresponds to the RESET signal. The
nonmaskable interrupt (NMI) has the second highest priority and corresponds to the NMI signal. The lowest priority interrupts are interrupts 4-15 corresponding to the
INT4-INT15 signals. RESET, NMI, and some of the INT4-INT15 signals are mapped to pins on C6000 devices.
The CPU supports exceptions as another type of interrupt. When exceptions are enabled, the NMI input behaves as an exception.

Priority Interrupt Name Interrupt Type

Highest Reset Reset

NMI Nonmaskable

INT4 Maskable

INT5 Maskable

INT6 Maskable

INT7 Maskable

INT8 Maskable

INT9 Maskable

INT10 Maskable

INT11 Maskable

INT12 Maskable

INT13 Maskable

INT14 Maskable

Lowest INT15 Maskable
在基于OSEck
RTOS的TI C66x DSP系统中， 这些中断的优先级将高于所有user定义的APP进程（即prioritied process），从而使中断能够在第一时间处理。