Intel iAPX 86/88 User Manual page 43

8086/8088 CPU
Table 1-16 Instruction Set Reference Data (continued)
DAS
I
DAS (no operands)
Decimal adjust for subtraction
FI 0 D ITS ZAP C
ags
U
XXXXX
Operands Clocks Transfers' Bytes Coding Example
(no operands) 4(4)
-
1
DAS
DEC
I
DEC destination
Flags
ODITSZAPC
Decrement by 1 X XXXX
Operands Clocks Transfers' Bytes Coding Example
reg 16 3(3)
-
1 DEC AX
reg8 3(3)
-
2 DECAL
memory 15(15)+EA 2 2-4 DEC ARRAY [SI]
DIV
I
DIV source
Division, unsigned
FIODITSZAPC
ags
U
UUUUU
Operands
Clocks Transfers' Bytes Coding Example
reg 8 80-90(29)
-
2 DIVCL
reg 16 144-162(38)
-
2 DIVBX
mem8 86-96+EA 1 2-4 DIVALPHA
(35)
mem 16 150-168+ 1 2-4 DIV TABLE [SI]
EA(94)
ENTER
I
ENTER
Flags
ODITSZAPC
Procedure entry
Operands Clocks Transfers' Bytes Coding Example
locals, level
L=0(15)
-
4 ENTER 28, 3
L=1(25)
L>1
(22+
16(n-1))
ESC
I
ESC external-opcode, source
Flags
ODITSZAPC
Escape
Operands Clocks Transfers' Bytes Coding Example
immediate, memory
8(6)+EA
1 2-4 ESC 6.ARRAY [SI]
immediate, register 2(2)
-
2 ESC 20, AL
HLT
I
HLT (no operands)
Flags
OD ITSZAPC
Halt
Operands Clocks Transfers' Bytes Coding Example
(no operands) 2(2)
-
1 HLT
"For the 8086 (80186) add four clocks for each 16·bit word transfer with an odd address. For the 8088 (80188) add four clocks for each 16·bit word
transfer.
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