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C-29
INSTRUCTION SET DESCRIPTIONS
LOOPNE
LOOPNZ
Loop While Not Equal:
Loop While Not Zero:
LOOPNE
disp8
LOOPNZ
disp8
Decrements CX by 1 and transfers
control to the target location if CX is
not 0 and if ZF is clear; otherwise the
next sequential instruction is executed.
Instruction Operands:
LOOPNE short-label
LOOPNZ short-label
(CX) ← (CX) – 1
if
(ZF) = 0 and (CX) ≠ 0
then
(IP) ← (IP) + disp8 (sign-ext to 16 bits)
AF –
CF –
DF –
IF –
OF –
PF –
SF –
TF –
ZF –
MOV Move (Byte or Word):
MOV
dest, src
Transfers a byte or a word from the
source operand to the destination
operand.
Instruction Operands:
MOV mem, accum
MOV accum, mem
MOV reg, reg
MOV reg, mem
MOV mem, reg
MOV reg, immed
MOV mem, immed
MOV seg-reg, reg16
MOV seg-reg, mem16
MOV reg16, seg-reg
MOV mem16, seg-reg
(dest)←(src) AF –
CF –
DF –
IF –
OF –
PF –
SF –
TF –
ZF –
Table C-4. Instruction Set (Continued)
Name Description Operation
Flags
Affected
NOTE: The three symbols used in the Flags Affected column are defined as follows:
– the contents of the flag remain unchanged after the instruction is executed
? the contents of the flag is undefined after the instruction is executed
the flag is updated after the instruction is executed