PM0214 Rev 9 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.
To Next Page
Loading...
Need help?
General
