AVR32AP datasheet(9/181 Pages) ATMEL

9 / 181 page

32001A–AVR32–06/06

AVR32

I0M - Interrupt level 0 mask

When this bit is set, level 0 interrupts are masked. If I0M and GM are cleared, INT0 interrupts

are enabled. The bit is automatically set when INT3, INT2, INT1 or INT0 processing is initiated.

Software may clear this bit after performing the necessary measures if nested INT0s should be

supported. This bit is cleared at reset.

GM - Global Interrupt Mask

When this bit is set, all interrupts are disabled. This bit overrides I0M, I1M, I2M and I3M. The bit

is automatically set when exception processing is initiated, Debug Mode is entered, or a Java

trap is taken. This bit is automatically cleared when returning from a Java trap. This bit is set

after reset.

R - Java Register Remap

When this bit is set, the addresses of the registers in the register file is dynamically changed.

This allows efficient use of the register file registers as a stack. For more details, see the Java

Technical Reference Manual. The R bit is cleared at reset. Undefined behaviour may result if

this bit is modified by the user.

T - Scratch bit

Not used by any instruction, but can be manipulated by application software as a scratchpad bit.

This bit is cleared after reset.

L - Lock flag

Used by the conditional store instruction. Used to support atomical memory access. Automati-

cally cleared by rete. This bit is cleared after reset.

Q - Saturation flag

The saturation flag indicates that a saturating arithmetic operation overflowed. The flag is sticky

and once set it has to be manually cleared by a csrf instruction after the desired action has been

taken. See the Instruction set description for details.

V - Overflow flag

The overflow flag indicates that an arithmetic operation overflowed. See the Instruction set

description for details.

N - Negative flag

The negative flag is modified by arithmetical and logical operations. See the Instruction set

description for details.

Z - Zero flag

The zero flag indicates a zero result after an arithmetic or logic operation. See the Instruction set

description for details.

C - Carry flag

The carry flag indicates a carry after an arithmetic or logic operation. See the Instruction set

description for details.

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