Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD 데이터 시트
제품 코드
ATSAM4S-WPIR-RD
191
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
12.6.11.6MRS
Move the contents of a special register to a general-purpose register.
Syntax
Syntax
MRS{cond} Rd, spec_reg
where:
condis an optional condition code, see
condis an optional condition code, see
.
Rdis the destination register.
spec_regcan be any of: APSR, IPSR, EPSR, IEPSR, IAPSR, EAPSR, PSR, MSP, PSP,
spec_regcan be any of: APSR, IPSR, EPSR, IEPSR, IAPSR, EAPSR, PSR, MSP, PSP,
PRIMASK, BASEPRI, BASEPRI_MAX, FAULTMASK, or CONTROL.
Operation
Use MRS in combination with MSR as part of a read-modify-write sequence for updating a PSR, for example to
Operation
Use MRS in combination with MSR as part of a read-modify-write sequence for updating a PSR, for example to
clear the Q flag.
In process swap code, the programmers model state of the process being swapped out must be saved, including
In process swap code, the programmers model state of the process being swapped out must be saved, including
relevant PSR contents. Similarly, the state of the process being swapped in must also be restored. These
operations use MRS in the state-saving instruction sequence and MSR in the state-restoring instruction sequence.
Note:
BASEPRI_MAX is an alias of BASEPRI when used with the MRS instruction.
See
Restrictions
Rd
must not be SP and must not be PC.
Condition Flags
This instruction does not change the flags.
Examples
This instruction does not change the flags.
Examples
MRS
R0, PRIMASK ; Read PRIMASK value and write it to R0
12.6.11.7MSR
Move the contents of a general-purpose register into the specified special register.
Syntax
Syntax
MSR{cond} spec_reg, Rn
where:
condis an optional condition code, see
condis an optional condition code, see
.
Rnis the source register.
spec_regcan be any of: APSR, IPSR, EPSR, IEPSR, IAPSR, EAPSR, PSR, MSP, PSP,
spec_regcan be any of: APSR, IPSR, EPSR, IEPSR, IAPSR, EAPSR, PSR, MSP, PSP,
PRIMASK, BASEPRI, BASEPRI_MAX, FAULTMASK, or CONTROL.