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PM0214 bảng dữ liệu(PDF) 174 Page - STMicroelectronics

tên linh kiện PM0214
Giải thích chi tiết về linh kiện  This programming manual provides information
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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PM0214 bảng dữ liệu(HTML) 174 Page - STMicroelectronics

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The STM32 Cortex-M4 instruction set
PM0214
174/245
DocID022708 Rev 4
MRS
R0, PRIMASK ; Read PRIMASK value and write it to R0
3.11.7
MSR
Move the contents of a general-purpose register into the specified special register.
Syntax
MSR{cond} spec_reg, Rn
where:
•
‘cond’ is an optional condition code, see Conditional execution on page 64.
•
‘Rn’ is the source register.
•
‘spec_reg’ can be any of: APSR, IPSR, EPSR, IEPSR, IAPSR, EAPSR, PSR, MSP,
PSP, PRIMASK, BASEPRI, BASEPRI_MAX, FAULTMASK, or CONTROL.
Operation
The register access operation in MSR depends on the privilege level. Unprivileged software
can only access the APSR, see Table 5: APSR bit definitions on page 20. Privileged
software can access all special registers.
In unprivileged software writes to unallocated or execution state bits in the PSR are ignored.
When you write to BASEPRI_MAX, the instruction writes to BASEPRI only if either:
•
Rn is non-zero and the current BASEPRI value is 0
•
Rn is non-zero and less than the current BASEPRI value.
See MRS on page 173.
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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