操    作
描    述
汇 编 指 令
周    期
MOVE
8-bit immediate
MOVS Rd,#<imm>
     1
Lo to Lo
MOVS Rd,Rm
     1
Any to Any
MOV Rd,Rm
     1
Any to PC
MOV PC,Rm
     3
Add
3-bit immediate
ADDS Rd,Rn,#<imm>
     1
All registers Lo
ADDS Rd,Rn,Rm
     1
操    作
描    述
汇 编 指 令
周    期
 
Any to Any
ADD Rd,Rd,Rm
     1
Any to PC
ADD PC,PC,Rm
     3
8-bit immediate
ADDS Rd,Rd,#<imm>
     1
With carry
ADCS Rd,Rd,Rm
     1
Immediate to SP
ADD SP,SP,#<imm>
     1
Form address from SP
ADD Rd,SP ,#<imm>
     1
Form address from PC
ADR Rd,<label>
     1
Subtract
Lo to Lo
SUBS Rd,Rn,Rm
     1
3-bit immediate
SUBS Rd,Rn,#<imm>
     1
8-bit immediate
SUBS Rd,Rd,#<imm>
     1
 
With carry
SBCS Rd,Rd,Rm
     1
Immediate from SP
SUB SP,SP,#<imm>
     1
Negate
RSBS Rd,Rn,#0
     1
Multiply
Multiply
MULS Rd,Rm,Rd
1或32
Compare
Compare
CMP Rn,Rm
     1
Negative
CMP Rn,Rm
     1
Immediate
CMP Rn,#<imm>
     1
Logical
AND
ANDS Rd, Rd, Rm
     1
Exclusive OR
EORS Rd, Rd, Rm
     1
OR
ORRS Rd, Rd, Rm
     1
Bit clear
BICS Rd, Rd, Rm
     1
Move NOT
MVNS Rd, Rm
     1
AND test
TST Rn, Rm 
     1
Shift
Logical shift left by immediate
LSLS Rd, Rm, #<shift>
     1
Logical shift left by register
LSLS Rd, Rd, Rs
     1
Logical shift right by immediate
LSRS Rd, Rm, #<shift>
     1
Logical shift right by register
LSRS Rd, Rd, Rs
     1
Arithmetic shift right
ASRS Rd, Rm, #<shift>
     1
Arithmetic shift right by register
ASRS Rd, Rd, Rs
     1
Rotate
Rotate right by register
RORS Rd, Rd, Rs
     1
Load
Word, immediate offset
LDR Rd, [Rn, #<imm>]
     2
Halfword, immediate offset
LDRH Rd, [Rn, #<imm>]
     2
Byte, immediate offset
LDRB Rd, [Rn, #<imm>]
     2
Word, register offset
LDR Rd, [Rn, Rm]
     2
操    作
描    述
汇 编 指 令
周    期
 
Halfword, register offset
LDRH Rd, [Rn, Rm]
     2
Signed halfword, register offset
LDRSH Rd, [Rn, Rm]
     2
Byte, register offset
LDRB Rd, [Rn, Rm]
     2
Signed byte, register offset
LDRSB Rd, [Rn, Rm]
     2
PC-relative
LDR Rd, <label>
     2
SP-relative 
LDR Rd, [SP, #<imm>]
     2
Multiple, excluding base
LDM Rn!, {<loreglist>}
   1+N
Multiple, including base
LDM Rn, {<loreglist>}
   1+N
Store
Word, immediate offset
STR Rd, [Rn, #<imm>]
     2
Halfword, immediate offset
STRH Rd, [Rn, #<imm>]
     2
Byte, immediate offset
STRB Rd, [Rn, #<imm>]
     2
Word, register offset
STR Rd, [Rn, Rm]
     2
 
Halfword, register offset
STRH Rd, [Rn, Rm]
     2
Byte, register offset
STRB Rd, [Rn, Rm]
     2
SP-relative
STR Rd, [SP, #<imm>]
     2
Multiple
STM Rn!, {<loreglist>}
   1+N
Push
Push
PUSH {<loreglist>}
   1+N
Push with link register
PUSH {<loreglist>, LR}
   1+N
Pop
Pop
POP {<loreglist>}
   1+N
Pop and return
POP {<loreglist>, PC}
   4+N
Branch
Conditional
B<cc> <label>
   1或3
Unconditional
B<label>
    3
With link
BL<label>
    4
With exchange
BX Rm
    3
With link and exchange
BLX Rm
    3
Extend
Signed halfword to word
SXTH Rd, Rm
    1
Signed byte to word
SXTB Rd, Rm
    1
Unsigned halfword
UXTH Rd, Rm
    1
Unsigned byte
UXTB Rd, Rm
    1
Reverse
Bytes in word
REV Rd, Rm
    1
Bytes in both halfwords
REV16 Rd, Rm
    1
Signed bottom half word
REVSH Rd, Rm
    1
State change
Supervisor Call
SVC #<imm>
    -
Disable interrupts
CPSID i
    1
Cortex-M0指令集（2）
续表
操    作
描    述
汇 编 指 令
周    期
 
Enable interrupts
CPSIE i
    1
Read special register
MRS Rd, <specreg>
    4
Write special register
MSR <specreg>, Rn
    4
Breakpoint
BKPT #<imm>
    —
Hint
Send event
SEV
    1
Wait for event
WFE
    2
Wait for interrupt
WFI
    2
Yield
YIELD
    1
Hint
No operation
NOP
    1
Barriers
Instruction synchronization
ISB
    4
Data memory
DMB
    4
Data synchronization
DSB
    4
ISO/IEC的C代码不能直接地获取一些Cortex-M0的指令。表7-23列举了CMSIS的C编译器中提供的部分内部函数用于产生这些指令。如果一个C编译器不支持恰当的内部函数，则需要用内嵌汇编来获取有关指令。
表7-23  CMSIS内部函数
指    令
CMSIS内部函数
指   offset指令是什么意思令
CMSIS内部函数
CPSIE i
void __enable_irq(void)
REV
uint32_t __REV(uint32_t int value)
CPSID i
void __disable_irq(void)
REV16
uint32_t __REV16(uint32_t int value)
ISB
void __ISB(void)
REVSH
uint32_t __REVSH(uint32_t int value)
DSB
void __DSB(void)
SEV
void __SEV(void)
DMB
void __DMB(void)
WFE
void __WFE(void)
NOP
void __NOP(void)
WFI
void __WFI(void)
CMSIS也提供了几个函数用于获取特殊的寄存器，如表7-24所示。
表7-24  CMSIS提供的用于获取特殊寄存器的函数
特殊寄存器
获 取 方 式
CMSIS函数
PRIMASK
读
uint32_t __get_PRIMASK(void)
写
void __set_PRIMASK(void)
CONTROL
读
Uint32_t __get_CONTROL(uint32_t value)
写
Void __set_CONTROL(uint32_t value)
MSP
读
Uint32_t __get_MSP(void)
写
Void __set_MSP(uint32_t TopOfMainStack)
PSP
读
Uint32_t __get_PSP(void)
写
Void __set_PSP(uint32_t TopOfMainStack)

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