5.11.4. Undefined instructions

The ARM9EJ-S core implements full ARMv5TE Undefined instruction handling. This means that any instruction defined in the ARM Architecture Reference Manual as UNDEFINED, automatically causes the ARM9EJ-S core to take the Undefined instruction trap. Any coprocessor instruction that is not accepted by a coprocessor also results in the ARM9EJ-S core taking the Undefined instruction trap.

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