PM0056 datasheet(91/156 Pages) STMICROELECTRONICS

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PM0056

The Cortex-M3 instruction set

Operation

These instructions do the following:

Rotate the value from Rm right by 0, 8, 16 or 24 bits.

Extract bits from the resulting value:

–

SXTB extracts bits[7:0] and sign extends to 32 bits.

–

UXTB extracts bits[7:0] and zero extends to 32 bits.

–

SXTH extracts bits[15:0] and sign extends to 32 bits.

–

UXTH extracts bits[15:0] and zero extends to 32 bits.

Restrictions

Do not use SP and do not use PC.

Condition flags

These instructions do not affect the flags.

Examples

SXTH

R4, R6, ROR #16

; Rotate R6 right by 16 bits, then obtain the lower

; halfword of the result and then sign extend to

; 32 bits and write the result to R4.

UXTB

R3, R10

; Extract lowest byte of the value in R10 and zero

; extend it, and write the result to R3

3.8.4

Branch and control instructions

Table 30 shows the branch and control instructions:

Table 30. Branch and control instructions

Mnemonic

Brief description

See

BBranch

B, BL, BX, and BLX on page 92

Branch with Link

B, BL, BX, and BLX on page 92

BLX

Branch indirect with Link

B, BL, BX, and BLX on page 92

Branch indirect

B, BL, BX, and BLX on page 92

CBNZ

Compare and Branch if Non

Zero

CBZ and CBNZ on page 93

CBZ

Compare and Branch if Non

Zero

CBZ and CBNZ on page 93

If-Then

IT on page 94

TBB

Table Branch Byte

TBB and TBH on page 96

TBH

Table Branch Halfword

TBB and TBH on page 96

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