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VEJ (VEctor subroutine
Jump)
One
step subroulinc
j1ut1p
instructio
n
that
jun1ps
to
the
address
indicated
by
the
t\VO-
bytc
vcct0r.
whose
high
o
rder
address byte is represented
by
FFH a
ncl
low order
address
byte by the
operand or the
instruction.
The nag Z
is
reset.
There arc 28
kinds or VE.I operartd wit
hin
two bytes
range
of
11000000 (COH)
to
111 101
IO
(F6H).
T
herefo re.
the
vector
address
table
contains
the
address
area
or
FFCOH
to FFF6H
.
•Format
VE.I
i
•
Operalion
PL.
-
(S)
S
-
1-
S
PH
-
(S)
S
-
1-
S
(
FFOOH+
i)
-
·
PH
(FFOOH
+
i+ I)
-
PL
NOTE:
i
has 28
k
inds
o
f
VEJ
operands.
(EX)
VEJ C4H
TM
contents
of
FFC4H
and FFCSH a
re
'i
«
-t-Of
interrogated at
the
address 4000H
and
SutlrOu
tnlf
IU!I\
()
jump
to
the subr-Outine
of
4500H.
\\lith
the
RTN
instr
uction
of the
subroutine.
the e.xecution
resum
es
from
lhe
address
4001H
again.
Because
it
permits
subroutine
jump by
a
sing
le
byte
of
instruction. it
t1elps to
reduce
program
steps.
'.vhen
applied
to
100 often appearing subrouline.
Do not sale this PDF!!!
.....
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1
C<H
VE.J
S'l~l•
UC
I
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ln.$VU('l•Ot'I
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H
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Re:mn
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A-Tr;
ffC'H
.:s.-1
ffC)ll
0011
....._
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