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CWD Convert Word to Doubleword Flags: not altered
CWD
Logic: if (AX < 8000h) then
DX . 0
else
DX . FFFFh
CWD extends the sign bit of the AX register into the DX register. This
instruction generates the double-word equivalent of the signed number
in the AX register.
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Operands Clocks Transfers Bytes Example
no operands 5 - 1 CWD
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Note: This instruction will set DX to 0FFFFh if the sign
bit (bit 15) of AX is set; if bit 15 of AX is not
set, DX will be set to 0.