CortexM0指令系统

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操作描述 8-bit immediate Lo to Lo 汇编指令 MOVS Rd,# MOVS Rd,Rm MOV Rd,Rm MOV PC,Rm ADDS Rd,Rn,# ADDS Rd,Rn,Rm 汇编指令 ADD Rd,Rd,Rm ADD PC,PC,Rm ADDS Rd,Rd,# ADCS Rd,Rd,Rm ADD SP,SP,# ADD Rd,SP ,# ADR Rd, SUBS Rd,Rn,Rm SUBS Rd,Rn,# SUBS Rd,Rd,# SBCS Rd,Rd,Rm SUB SP,SP,# RSBS Rd,Rn,#0 MULS Rd,Rm,Rd 周期 1 1 1 3 1 1 周期 1 3 1 1 1 1 1 1 1 1 1 1 1 1或MOVE Any to Any Any to PC 3-bit immediate Add All registers Lo 操作描述 Any to Any Any to PC 8-bit immediate With carry Immediate to SP Form address from SP Form address from PC Lo to Lo Subtract 3-bit immediate 8-bit immediate With carry Immediate from SP Negate Multiply Multiply 32 Compare Compare Negative Immediate AND Exclusive OR OR Logical Bit clear Move NOT AND test Logical shift left by immediate Logical shift left by register Logical shift right by Shift immediate Logical shift right by register Arithmetic shift right Arithmetic shift right by register Rotate Rotate right by register Word, immediate offset Halfword, immediate offset Load Byte, immediate offset Word, register offset 操作描述 Halfword, register LDRB Rd, [Rn, #] LDR Rd, [Rn, Rm] 汇编指令 LDRH Rd, [Rn, 周期 2 BICS Rd, Rd, Rm MVNS Rd, Rm TST Rn, Rm LSLS Rd, Rm, # LSLS Rd, Rd, Rs LSRS Rd, Rm, # LSRS Rd, Rd, Rs ASRS Rd, Rm, # ASRS Rd, Rd, Rs RORS Rd, Rd, Rs LDR Rd, [Rn, #] LDRH Rd, [Rn, #] CMP Rn,Rm CMP Rn,Rm CMP Rn,# ANDS Rd, Rd, Rm EORS Rd, Rd, Rm ORRS Rd, Rd, Rm 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 offset Signed halfword, register offset Byte, register offset Signed byte, register offset PC-relative SP-relative Multiple, excluding base Multiple, including base Word, immediate offset Halfword, Store immediate offset Byte, immediate offset Word, register offset Halfword, register offset Byte, register offset SP-relative Multiple Push Push Push with link register Pop Pop Pop and return Conditional Branch Unconditional With link Rm] LDRSH Rd, [Rn, Rm] LDRB Rd, [Rn, Rm] LDRSB Rd, [Rn, Rm] LDR Rd, LDR Rd, [SP, #] LDM Rn!, {} LDM Rn, {} STR Rd, [Rn, #] STRH Rd, [Rn, #] STRB Rd, [Rn, #] STR Rd, [Rn, Rm] STRH Rd, [Rn, Rm] STRB Rd, [Rn, Rm] STR Rd, [SP, #] STM Rn!, {} PUSH {} PUSH {, LR} POP {} POP {, PC} B B BL 2 2 2 2 2 1+N 1+N 2 2 2 2 2 2 2 1+N 1+N 1+N 1+N 4+N 1或3 3 4 With exchange With link and exchange Signed halfword to word Extend Signed byte to word Unsigned halfword Unsigned byte Bytes in word Bytes in both Reverse halfwords Signed bottom half word State change Supervisor Call Disable interrupts BX Rm BLX Rm SXTH Rd, Rm SXTB Rd, Rm UXTH Rd, Rm UXTB Rd, Rm REV Rd, Rm REV16 Rd, Rm REVSH Rd, Rm SVC # CPSID i 3 3 1 1 1 1 1 1 1 - 1 Cortex-M0指令集（2）续表

操作描述 Enable interrupts Read special register Write special register Breakpoint Send event Wait for event Wait for interrupt Yield Hint Barriers No operation Instruction synchronization Data memory 汇编指令 CPSIE i MRS Rd, MSR , Rn BKPT # SEV WFE WFI YIELD NOP ISB DMB 周期 1 4 4 — 1 2 2 1 1 4 Hint 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 CPSIE i CPSID i ISB DSB DMB NOP CMSIS内部函数 void __enable_irq(void) void __disable_irq(void) void __ISB(void) void __DSB(void) void __DMB(void) void __NOP(void) EV REV16 REVSH SEV WFE WFI 指令 RCMSIS内部函数 uint32_t __REV(uint32_t int value) uint32_t __REV16(uint32_t int value) uint32_t __REVSH(uint32_t int value) void __SEV(void) void __WFE(void) 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 PRIMASK CONTROL 获取方式读写读写读 MSP 写读 PSP 写 CMSIS函数 uint32_t __get_PRIMASK(void) void __set_PRIMASK(void) Uint32_t __get_CONTROL(uint32_t value) Void __set_CONTROL(uint32_t value) Uint32_t __get_MSP(void) Void __set_MSP(uint32_t TopOfMainStack) Uint32_t __get_PSP(void) Void __set_PSP(uint32_t TopOfMainStack)

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