Datasheet

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

12.4.1.9 Application Program Status Register

Name: APSR

Access: Read/Write

Reset: 0x000000000

The APSR contains the current state of the condition flags from previous instruction executions.

 N: Negative Flag

0: Operation result was positive, zero, greater than, or equal

1: Operation result was negative or less than.

 Z: Zero Flag

0: Operation result was not zero

1: Operation result was zero.

 C: Carry or Borrow Flag

Carry or borrow flag:

0: Add operation did not result in a carry bit or subtract operation resulted in a borrow bit

1: Add operation resulted in a carry bit or subtract operation did not result in a borrow bit.

 V: Overflow Flag

0: Operation did not result in an overflow

1: Operation resulted in an overflow.

 Q: DSP Overflow and Saturation Flag

Sticky saturation flag:

0: Indicates that saturation has not occurred since reset or since the bit was last cleared to zero

1: Indicates when an

SSAT

USAT

instruction results in saturation.

This bit is cleared to zero by software using an

MRS

instruction.

 GE[19:16]: Greater Than or Equal Flags

See “SEL” for more information.

31 30 29 28 27 26 25 24

NZCVQ –

23 22 21 20 19 18 17 16

– GE[3:0]

15 14 13 12 11 10 9 8

–

76543210

–