Convert Word to DoubleWord
|
86/88 |
Y |
186 |
Y |
286 |
Y |
386 |
Y |
486 |
Y |
CWD |
|
Ovfl |
N |
Dir |
N |
Int |
N |
Trap |
N |
Sign |
N |
Zero |
N |
Aux |
N |
Prty |
N |
Carry |
N |
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.
------------------------------------ Timing ----------------------------------
OpCode Instruction 386 286 86
99 CWD 2 2 5
------------------------------------ Logic -----------------------------------
If (AX < 8000h) then
DX = 0
else
DX = 0FFFFh
See Also CWDE CBW CDQ DIV IDIV |