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ARM Program State Register

In ARM mode, there are 16 data registers and 1 or 2 status registers that are accessible at any time. In privileged mode , the corresponding special group of registers can be used.

operating mode ;
The functions of each bit of the status register are as follows:
Among them, it is important to pay attention to the upper 4 bits (28-31) and the lower 8 bits (0-7).
Note:
- DNM (Do Not Modify): different from the assignment by software;
- Condition code flags: N, Z, C, V. These bits can be operated by logical or arithmetic operations, or MSR and LDM instructions. The processor will test these flags to determine whether to operate some instructions.
- Control bits (lower 8 bits I, F, T, M[4:0]). When an exception occurs, the values of these bits will change accordingly. In privileged mode, these bits can also be modified by software. They are used more frequently.

Keywords：ARM PSR Reference address：(VI) ARM Status Register - PSR

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