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Home > Programmers Model > Program status registers > The T bit |
The T bit reflects the instruction set state:
when the T bit is set, the processor executes in Thumb state
when the T bit is clear, the processor executes in ARM state.
Never use an MSR
instruction to force a
change to the state of the T bit in the CPSR. The processor ignores
any attempt to modify the T bit using an MSR
instruction.