76
A
ll
and more about Sharp PC-1500
at
http://
www
.PC-1500.info
0 Wait time
of
1/0 port controller itself
When the
CP
U acc
es
ses the 1/ 0
pon
con
t
ro
ll
er. wait of a single
CPU
machine
cyc
le is
auw
m
at
ica
ll
y
app
l
ie
d.
If the
WO
and
WI
is
in the \\
".
tit slate when the
CP
U accessed the 1/0
po
rt
co
ntrolle
r.
\\iait
en
ds in one c
yc
l
e.
NOTE: When there is no \•1ait conditi
on
ir
)
WO
and \V1 . the same
\'l3vefoun
as
MEO
ar1d
ME 1
a
re
sent on
DMEO
and
0M
E1.
' .
t<-
i
~
:
'
'
•
!\_
' '
' '
'
A
O------:
-
---:---------
--
-
--,
-,
-,
' '
' '
Mt0/
1--
+.
,
r:.
--
-:
.
-
.
-----------
-:
.
~.
L
-
_.,
:
.....
-+
'
I+.
tO
~
·
,.,...
1$
I
1
' I I
I I
All
'
,----=
~~~~
---..;
.
~
OM
E0/
1
--
-T-
--~
' '
' '
' '
. '
' '
' '
··
---+-'.-
--
-7
'
-i
'-
-c=
==
===
====:
·
:t·=
)-
. '
I
1
I I '
•+- !P -:..:-
----
-«
------
' '
'
'
<--
,,--->
:<
---
- -
------
.;.>
"
' '
'
tr'
and
'"'
for
ac
tual
RO
M is
as
f-o
llows:
t p· = t
,\
P + l P + l D
rn· = IA - ID -
IS
1 s =
200
nS
Si
nc
e
l..<\
P
and
to
diff
er
depending o n
th
e pcri1>hcral circuit configurati
on
.1h
eys
h
ou
ld
be
corn
put
cd on 1hc
bas
is
of
lo.a
d
c.a
pacitanc
c.
3-4-3. Serial data input
SDI
is a serial
data
transfer input
and
CLJ serial
data
transfer clock.
n ic 1/ 0
por
t controll
er
re
ad
s the
input
d<
lla al the rising edge
of
CU
.
Serial
dat
a
goes
int
o
the
r'
Ccc
i
ving
111
ode
\v
he
n it
ch
an
ges
fr
()
ll
l
an
idl
e
state
(SD
l= I) to l
ow
· state and r
ea
ds
da
ta f
ro
m a next clock.
S
OI
=:x:
__
__,X~
_
__,
X
~-
C
ll
W
he
n the
8-
bit darn is received. it sets the recei
ve
and
Oag
RD acti
ve
. lf the
ma
sk
l>
it is on at
this
po
int. int
erru
pt rcqucsl is issued to the CPU. RD wi
ll
be reset upon readi
ng
the 8-bit
da
ta.
RD will be reset in a
cou
rse of ser
ia
l da1a receiving. which is the period t
ha
t the 8-bit
da
rn
is
be
in
g
rt:
cc
i
vc
d. \vith(lut
in
c
ludi
ng
the
siart b
it.
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