3.11 Application Program Status Register

The Application Program Status Register (APSR) holds the program status flags that are accessible in any processor mode.

It holds copies of the N, Z, C, and V condition flags. The processor uses them to determine whether or not to execute conditional instructions.

The APSR also holds:

  • The Q (saturation) flag.
  • The APSR also holds the GE (Greater than or Equal) flags. The GE flags can be set by the parallel add and subtract instructions. They are used by the SEL instruction to perform byte-based selection from two registers.

These flags are accessible in all modes, using the MSR and MRS instructions.

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