3 Static Priority Interrupts
The tinyAVR 0- and 1-series, and megaAVR 0-series by default use an interrupt vector table with static priority. This is identical to other classic tinyAVR® and megaAVR® MCUs and for most standard applications this is the preferred method of operation.
The Static Priority Interrupt scheme is applicable for priority level 0 interrupts only. Information on higher level interrupts is located in the High Priority Interrupt Vector and Non-Maskable Interrupts chapters.