Move Byte - Sign-Extended - Analog Devices ADSP-BF53x Blackfin Reference

Move Byte – Sign-Extended
General Form
dest_reg = src_reg_byte (X)
Syntax
Dreg = Dreg_byte (X) ;
Syntax Terminology
:
Dreg_byte R7–0.B
Instruction Length
In the syntax, comment (a) identifies 16-bit instruction length.
Functional Description
The Move Byte – Sign-Extended instruction converts a signed byte to a
signed word (32 bits). It copies the least significant 8 bits from a source
register into the least significant 8 bits of a 32-bit register. The instruction
sign-extends the upper bits of the destination register. This instruction
supports only D-registers.
Flags Affected
The following flags are affected by the Move Byte – Sign-Extended
instruction.
• is set if result is zero; cleared if nonzero.
AZ
• is set if result is negative; cleared if non-negative.
AN
• is cleared.
AC0
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
/* (a) */
, the low-order 8 bits of each Data Register
Move
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