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PM0223 データシート(PDF) 74 Page - STMicroelectronics |
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PM0223 データシート(HTML) 74 Page - STMicroelectronics |
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74 / 110 page  The STM32L0 Cortex-M0+ Instruction Set PM0223 74/110 DocID025763 Rev 1 3.7.6 MRS Move the contents of a special register to a general-purpose register. Syntax MRS Rd, spec_reg where: Operation MSR stores the contents of a special-purpose register to a general-purpose register. The MSR instruction can be combined with the MSR instruction to produce read-modify-write sequences, which are suitable for modifying a specific flag in the PSR. See 3.7.7: MSR on page 75. Restrictions In this instruction, Rd must not be SP or PC. If the current mode of execution is not privileged, then the values of all registers other than the APSR read as zero. Condition flags This instruction does not change the flags. Examples MRS R0, PRIMASK ; Read PRIMASK value and write it to R0 Rd Is the general-purpose destination register. spec_reg Is one of the special-purpose registers: APSR, IPSR, EPSR, IEPSR, IAPSR, EAPSR, PSR, MSP, PSP, PRIMASK, or CONTROL. |
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