AT32AP7002 datasheet(21/896 Pages) ATMEL

21 / 896 page

32054F–AVR32–09/09

AT32AP7002

6.2.7

Unimplemented instructions

The following instructions are unimplemented in AVR32 AP, and will cause an Unimplemented

Instruction Exception if executed:

•mems

•memc

•memt

6.2.8

Exceptions and Interrupts

AVR32 AP incorporates a powerful exception handling scheme. The different exception

sources, like Illegal Op-code and external interrupt requests, have different priority levels, ensur-

ing a well-defined behavior when multiple exceptions are received simultaneously. Additionally,

pending exceptions of a higher priority class may preempt handling of ongoing exceptions of a

lower priority class. Each priority class has dedicated registers to keep the return address and

status register thereby removing the need to perform time-consuming memory operations to

save this information.

There are four levels of external interrupt requests, all executing in their own context. The INT3

context provides dedicated shadow registers ensuring low latency for these interrupts. An inter-

rupt controller does the priority handling of the external interrupts and provides the autovector

offset to the CPU.

The addresses and priority of simultaneous events are shown in Table 6-2 on page 22.

AT32AP7002 Datasheet(PDF) 21 Page - ATMEL Corporation