PM0215 The STM32 Cortex-M0 instruction set
Doc ID 022979 Rev 1 65/91
3.7.7 MSR
Move the contents of a general-purpose register into the specified special register.
Syntax
MSR spec_reg, Rn
where:
● ‘Rn’ is the general-purpose source register.
● ‘spec_reg’ is the special-purpose destination register: APSR, IPSR, EPSR, IEPSR,
IAPSR, EAPSR, PSR, MSP, PSP, PRIMASK, or CONTROL.
Operation
MSR updates one of the special registers with the value from the register specified by Rn.
See MRS on page 64.
Restrictions
Rn must not be SP and must not be PC.
Condition flags
This instruction updates the flags explicitly based on the value in Rn.
Examples
MSR CONTROL, R1 ; Read R1 value and write it to the CONTROL register
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