Datasheet

120
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
Rd is the destination register.
Rn is the register holding the operand.
Operation
Use these instructions to change endianness of data:
REV converts either:
 32-bit big-endian data into little-endian data
 32-bit little-endian data into big-endian data.
REV16 converts either:
 16-bit big-endian data into little-endian data
 16-bit little-endian data into big-endian data.
REVSH converts either:
 16-bit signed big-endian data into 32-bit signed little-endian data
 16-bit signed little-endian data into 32-bit signed big-endian data.
Restrictions
Do not use SP and do not use PC
.
Condition Flags
These instructions do not change the flags.
Examples
REV R3, R7; Reverse byte order of value in R7 and write it to R3
REV16 R0, R0; Reverse byte order of each 16-bit halfword in R0
REVSH R0, R5; Reverse Signed Halfword
REVHS R3, R7; Reverse with Higher or Same condition
RBIT R7, R8; Reverse bit order of value in R8 and write the result to R7.