Intel iAPX 86/88 User Manual page 44

8086/8088 CPU
Table 1-16 Instruction Set Reference Data (continued)
IDIV
IIDIV source
Integer division
FI
0 01
T S ZAP C
ags U U U U U U
Operands Clocks Transfers· Bytes Coding Example
reg 8
101-112
-
2 IDIVBL
(44-52)
reg 16
165-184
-
2 IDIVCX
(53-61)
mem8
107-118+ 1 2-4
IDIV DIVISOR_BYTE [SI)
EA(50-58)
mem 16
171-190+ 1 2-4 IDIV [BX].DIVISOR_WORD
EA(58-67)
IMUL
IIMUL source
Integer multiplication
FI
0 0
ITS ZAP C
ags X
UUUUX
Operands
Clocks
Transfers·
Bytes Coding Example
immed8
(22-24)
-
3 IMUL6
immed 16
(29-32)
-
4 IMUL20
reg 8
80-98
-
2 IMULCL
(25-28)
reg 16 128-154
-
2 IMULBX
(34-37)
mem8
86-104+ 1 2-4
IMUL RATE_BYTE
EA(31-34)
mem 16
134-160+
1 2-4 IMUL RATE_WORD [BP) (01)
EA(40-43)
IN
liN accumulator, port
Flags
ODITSZAPC
Input byte or word
Operands Clocks
Transfers·
Bytes Coding Example
accumulator, immed 8 10(10) 1 2 IN AL, OFFEAH
accumulator, OX 8(8) 1 1 IN AX, OX
INC
IINC destination
Flags
~
0
I
TSZAPC
Increment by 1 XXXX
Operands
Clocks
Transfers·
Bytes
Coding Example
reg 16 3(3)
-
1
iNCCX
reg 8 3(3)
-
2 INCBL
memory 15(15)+EA 2 2-4 INC ALPHA [01) [BX)
INS
IINS source-string, port
Input string
Flags 0 0 ITS ZAP C
Operands Clocks "TI'ansfers· Bytes Coding Example
dest·string, port (14) 2
1
INS BUFF1, USART D
(repeat) dest-string, port
(9
+
8/rep)
2/rep 1 REP INS BUFF1, USART D
'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.
1-28
210912-001