PM0214 Rev 10
21/262
PM0214
The Cortex-M4 processor
261
Application program status register
The APSR contains the current state of the condition flags from previous instruction 
executions. See the register summary in Table 3 on page 18 for its attributes. The bit 
assignment is:
          
Table 5. APSR bit definitions 
Bits
Description
Bit 31
N: Negative or less than flag:
0: Operation result was positive, zero, greater than, or equal
1: Operation result was negative or less than.
Bit 30
Z: Zero flag:
0: Operation result was not zero
1: Operation result was zero.
Bit 29
C: 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.
Bit 28
V: Overflow flag:
0: Operation did not result in an overflow
1: Operation resulted in an overflow.
Bit 27
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 or USAT instruction results in saturation, or indicates a 
DSP overflow.
This bit is cleared to zero by software using an MRS instruction.
Bits 26:20
Reserved.
Bits 19:16
GE[3:0]: Greater than or Equal flags. See SEL on page 105 for more information.
Bits 15:0
Reserved.