Intel 210200-002 manual CWD Convert Word CWD To Doubleword

CWD CONVERT WORD CWD

TO DOUBLEWORD

Operation:	Flags Affected:
if (AX) <8000H then (OX) ~ 0	None
else (OX) ~ FFFFH

Description:

CWD (Convert Word to Doubleword) extends the sign of the word in register AX throughout register DX. CWD does not affect any flags. CWD can be used to produce a double-length (doubleword) dividend from a word prior to performing word division.

Encoding:

1100110011

CWD Operands Clocks Transfers Bytes CWD Coding Example

(no operands) 5 - 1 CWO

2-69