PM0056 datasheet(88/156 Pages) STMICROELECTRONICS

88 / 156 page

The Cortex-M3 instruction set

PM0056

88/156

DocID15491 Rev 5

To read the state of the Q flag, use the MRS instruction (see MRS on page 100).

Restrictions

Do not use either SP or PC.

Condition flags

These instructions do not affect the condition code flags.

If saturation occurs, these instructions set the Q flag to 1.

Examples

SSATR7, #16, R7, LSL #4; logical shift left value in R7 by 4, then

; saturate it as a signed 16-bit value and

; write it back to R7

USATNER0, #7, R5; conditionally saturate value in R5 as an

; unsigned 7 bit value and write it to R0

3.8

Bitfield instructions

Table 29 shows the instructions that operate on adjacent sets of bits in registers or bitfields.

Table 29. Packing and unpacking instructions

Mnemonic

Brief description

See

BFC

Bit field clear

BFC and BFI on page 89

BFI

Bit field insert

BFC and BFI on page 89

SBFX

Signed bit field extract

SBFX and UBFX on page 89

SXTB

Sign extend a byte

SXT and UXT on page 90

SXTH

Sign extend a halfword

SXT and UXT on page 90

UBFX

Unsigned bit field extract

SBFX and UBFX on page 89

UXTB

Zero extend a byte

SXT and UXT on page 90

UXTH

Zero extend a halfword

SXT and UXT on page 90

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