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REF
REFERENCES
REF
FOR
INSTRUCTION
SET
Key
to
Operand Types
IDENTIFIER
(no operands)
register
reg
16
seg-reg
accumulator
immediate
immed8
memory
mem8
mem16
source-table
source-string
dest-string
DX
short-label
near-label
far-label
near-proc
far-proc
memptr16
memptr32
regptr16
repeat
EXPLANATION
No operands are written
An
8-
or
16-bit general register
An
16-bit general register
A segment register
Register
AX
or
AL
A
constant
in
the
range
O-FFFFH
A constant in the range
O-FFH
An 8-
or
16-bit
memory
10cation
(1
)
An
8-bit memory
10cation(1)
A 16-bit memory location(1)
Name of 256-byte translate
table
Name of string addressed by
register
SI
.
Name of string, addressed by
register
DI
Register
DX
A label within -128 to +127
bytes of the end of the
instruction
A
label
in
current
code
segment
A
label in
another
code
segment
A procedure
in
current code
segment
A procedure in another code
segment
A word containing the offset of
the
location
in
the current code
segment to which
control is to
be
transferred
l1
)
A doubleword containing the
offset and the segment base
address of the
location
in
another
code
segment
to
which
control is to be trans-
ferred(1)
A
16-bit
general
register
containing the offset of the
location
In
the current code
segment to which
control is to
be transferred
A string instruction repeat
prefix
11)
Any addressing
mode-direct,
register
indirect, based, indexed,
or
based
indexed-
may
be used (see section
2.8).
1514131211109
B 7 6
54
321
0
OF
OF
IF
TF
SF
ZF
AF
PF
CF
I
L:::
CARRY
PARITY
AUXILIARY
CARRY
ZERO
SIGN
TRAP
INTERRUPT
DIRECTION
OVERFLOW
Effective Address Calculation Time
EA
COMPONENTS
Displacement Only
Base or Index Only
(BX,BP,SI,DI)
Displacement
+
Base
or
Index
(BX,BP,SI,DI)
Base
BP+
DI,
BX+SI
+
Index
BP+SI,
BX+
DI
Displacement
BP+DI+DISP
+
BX+SI+DISP
Base
+
BP+SI+DISP
Index
BX+DI+DISP
* Add 2 clocks for segment override
Notation Key
+ Addition
Subtraction
Multiplication
Division
% Modulo
Concatenation
& And
+-
Assignment
2-46
CLOCKS·
6
5
9
7
8
11
12