PM0214 datasheet(89/245 Pages) STMICROELECTRONICS

89 / 245 page

DocID022708 Rev 4

89/245

PM0214

The STM32 Cortex-M4 instruction set

244

Restrictions

You can use SP and PC only in the MOV instruction, with the following restrictions:

•

The second operand must be a register without shift

•

You must not specify the S suffix

When Rd is PC in a MOV instruction:

•

bit[0] of the value written to the PC is ignored

•

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

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

•

Can update the C flag during the calculation of operand2 (see Flexible second operand

on page 59).

•

Do not affect the V flag

Example

MOVS R11, #0x000B

; write value of 0x000B to R11, flags get updated

MOV R1, #0xFA05

; write value of 0xFA05 to R1, flags not updated

MOVS R10, R12

; write value in R12 to R10, flags get updated

MOV R3, #23

; write value of 23 to R3

MOV R8, SP

; write value of stack pointer to R8

MVNS R2, #0xF

; write value of 0xFFFFFFF0 (bitwise inverse of 0xF)

; to the R2 and update flags

PM0214 Datasheet(PDF) 89 Page - STMicroelectronics

PM0214 Datasheet(HTML) 89 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 92 93 94 95 96 97 98 99 100 ...More

Datasheet Descarga

Enlace URL