STR912 中断优先级分两组: VICO, VIC1, 由于硬件设计的原因, VICO 内中断源的优先机都高于VIC1的. Interrupt Priority The FIQ interrupt has the highest priority and is followed by the 32 vectored interrupts. The interrupt priority is based on the position of the vectored interrupt, where VIC0 Vectored Interrupt 0 has the highest priority and VIC1 Vectored Interrupt 15 has the lowest priority. The priority is hardwired and can not be changed. Each of the Vectored Interrupts has a Control Register which specifies the input source of the interrupt. Depending on your application requirement, you can assign an interrupt source/input to a low or high priority Vectored Interrupt by writing to the Control Register. The Vectored Interrupt priority is fixed by hardware, but the interrupt input source to the Vectored Interrupt is software programmable (selectable).
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