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MICROPROCESSOR INSTRUCTION REFERENCE->EXTB
EXTB Sign Extend Byte to Long Word
Sign Extended Destination -> Destination
Assembler Syntax: EXTB.L Dn extend byte to long word
Size: Long
Condition Codes:
N Set if result negative, else cleared
Z Set if result zero, else cleared
V Always cleared
C Always cleared
X Not affected
See EXT for other sign extension instructions