User's Manual
THE
80286
INSTRUCTION SET
Jcond-Jump Short If Condition Met
Opcode
Instruction
Clocks·
Description
77
cb
JA
cb
7,noj=3
Jump short if above (CF=O
and
ZF=O)
73
cb
JAE
cb
7,noj=3
Jump short if above
or
equal (CF=O)
72
cb
JB cb
7,noj=3
Jump short if below (CF=1)
76
cb
JBE cb
7,noj=3
Jump short if below or equal (CF=1 or
ZF=1)
72
cb JC cb
7,noj=3
Jump short if carry (CF=1)
E3
cb JCXZ cb
8,noj=4
Jump short if
CX
register
is
zero
74
cb JE cb
7,noj=3
Jump short if
equal
(ZF=1)
7F
cb
JG
cb
7,noj=3
Jump short if greater (ZF=O
and
SF=OF)
70
cb
JGE
cb
7,noj=3
Jump short if greater or equal (SF=OF)
7C
cb JL cb
7,noj=3
Jump short if less (SF/=OF)
7E
cb JLE
cb
7,noj=3
Jump short if less or
equal
(ZF=1 or SF/=OF)
76 cb JNA cb
7,noj=3
Jump short if not above (CF=1 or
ZF=1)
72
cb
JNAE cb
7,noj=3
Jump short if not above/equal (CF=1)
73
cb
JNB cb
7,noj=3
Jump short if not below (CF=O)
77
cb
JNBE cb
7,noj=3
Jump short if not below/equal (CF=O and
ZF=O)
73
cb
JNC
cb
7,noj=3
Jump short if not carry (CF=O)
75
cb
JNE
cb
7,noj=3
Jump short if not
equal
(ZF=O)
7E
cb
JNG
cb
7,noj=3
Jump short if not greater (ZF=1 or SF/=OF)
7C
cb
JNGE
cb
7,noj=3
Jump short if not greater/equal (SF/=OF)
70
cb
JNL
cb
7,noj=3
Jump short if not less (SF=OF)
7F
cb
JNLE cb
7,noj=3
Jump short
if
not
less/equal
(ZF=O
and
SF=OF)
71
cb
JNO
cb
7,noj=3
Jump short if not overflow (OF=O)
7B
cb JNP
cb
7,noj=3
Jump short if not parity (PF=O)
79
cb
JNS cb
7,noj=3
Jump short if not sign (SF=O)
75
cb JNZ cb
7,noj=3
Jump short if not zero (ZF=O)
70
cb JO
cb
7,noj=3
Jump short if overflow (OF=1)
7A
cb
JP
cb
7,noj=3
Jump short if parity (PF=1)
7A
cb
JPE
cb
7,noj=3
Jump short if parity
even
(PF=1)
7B
cb
JPO
cb
7,noj=3
Jump short if parity odd (PF=O)
78
cb
JS
cb
7,noj=3
Jump short if sign (SF=1)
74
cb JZ cb
7,noj=3
Jump short if zero (ZF=1)
'When
a jump is taken,
add
one clock fo;
eVery
byte of the next instruction executed.
FLAGS MODIFIED
None
FLAGS UNDEFINED
None
OPERATION
Conditional jumps (except for JCXZ, explained below) test the flags, which presumably have been set
in
some meaningful
way
by a previous instruction. The conditions for each mnemonic are given
in
parentheses after each description above. The terms "less" and "greater" are used for comparing signed
integers;
"above" and "below" are used for unsigned integers.
B-54