Zilog Z80380 - Manual (Page 92)

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Z380 ™
U SER ' S M ANUAL
DC-8297-03
Z ILOG
EXTSW
EXTEND SIGN (WORD)
EXTSW [HL]
Operation: If (HL(15)=0) then begin
HL(31-16)
←
0000h
end
else begin
HL(31-16)
←
FFFFh
end
The contents of the low word of the HL register, considered as a signed, two's complement
integer, are sign-extended to 32 bits in the HL register. This instruction is useful for
conversion of 16-bit signed operands into 32-bit signed operands.
Flags: S: Unaffected
Z: Unaffected
H: Unaffected
V: Unaffected
N: Unaffected
C: Unaffected
Addressing Execute
Mode Syntax Instruction Format Time Note
EXTSW [HL] 11101101 01110101 3