PM0215 datasheet(54/91 Pages) STMICROELECTRONICS

54 / 91 page

The STM32 Cortex-M0 instruction set

PM0215

54/91

Doc ID 022979 Rev 1

3.5.5

MOV, MOVS and MVNS

Move and move NOT.

Syntax

MOV{S} Rd, Rm

MOVS Rd, #imm

MVNS Rd, Rm

where:

●

‘S’ is an optional suffix. If S is specified, the condition code flags are updated on the

result of the operation (see Conditional execution on page 39).

●

‘Rd’ is the destination register

●

‘Rm’ is a register

●

‘imm’ is any value in the range 0-255

Operation

The MOV instruction copies the value of Rm into Rd.

The MOVS instruction performs the same operation as the MOV instruction, but also

updates the N and Z flags.

The MVNS instruction takes the value of Rm, performs a bitwise logical NOT operation on the

value, and places the result into Rd.

Restrictions

In these instructions, Rd, and Rm must only specify R0-R7.

When Rd is the PC in a MOV instruction:

●

bit[0] of the result is ignored

●

A branch occurs to the address created by forcing bit[0] of that value to 0. The T-bit

remains unmodified.

Note:

Though it is possible to use MOV as a branch instruction, ARM strongly recommends the use

of a BX or BLX instruction to branch for software portability to the ARM instruction set.

Condition flags

If S is specified, these instructions:

●

Update the N and Z flags according to the result

●

Do not affect the C or V flag

Example

MOVS

R0, #0x000B

; Write value of 0x000B to R0, flags get updated

MOVS

R1, #0x0

; Write value of zero to R1, flags are updated

MOV

R10, R12

; Write value in R12 to R10, flags are not updated

MOVS

R3, #23

; Write value of 23 to R3

MOV

R8, SP

; Write value of stack pointer to R8

MVNS

R2, R0

; Write inverse of R0 to the R2 and update flags

PM0215 Datenblatt(PDF) 54 Page - STMicroelectronics

PM0215 Datenblatt(HTML) 54 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91

Datenblatt Download

Link URL