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more about Sharp
PC-1500
at http://www.PC-1500.info
3-4.
Functions
3-4-1. Operation
1/0 port controller operation
CS2
CS
1
cso
RS3
RS2
RS1
RSO
R/W
Operation
0
1
0
0
0
Resets the
di
vid~r
intl'!rnally
cont
ained
in
the-
1
10
POfl
Ch
ip
.
0
1
0
I
I
Heads
the
contcins
o
f
the-
u
f
e91ster
an
d
sen
u1s
thern
o
n
the
d ata
bus.
At
the
sanl
e
tiroe.
1
ho
tcccivc
flag
RO
is
rC-sQt.
0
I
I
0
0
The
con
tents
of
th
e
data
bus
are
con•oerted into
a
serial
data
::;:igna1
of
stan/
do10/
stop
s1n1
cture.
Al
lhft
sitme
t1r1u~!
,
the
tr(lnsmit l!ag
TO
is
reset.
0
1
1
0
1
I
1
0
The
contenis of
lhe
data b
us
are
sio:ed
in
the
f
ro-gister.
0
I
The
contents
o1
thc
data
t>us
arc
sto
red
in
the
OPC
register.
I
0
0
0
I
I
The
Cc)nten1s of the
OPC
cegister
arc
sen!
o
n
!he
dala
bus.
0
I
Tl)e
c;on
1
en1s
of
the
di:tta
bvs
;.
n
e
stored
in
the
G
register.
I
0
0
1
1
The contents o1 !he G
regislCf
arc
sc1n
on
the
Cata
bus.
0
The
contenis
ol
the data
b
us
(lfC
stofcd in
the
I
0
1
1'.
'
iSK
re-gis1er.
0
I
Ttle
conten1s
of the
MSK
cegistcr
o.tc son1
on
lhc
e1a
1
a
bus.
0
The
c.on1en1s
<>I
1
he
data
b~J
S
are
stored"
in
the
I
F
fC9•Stef.
I
0
,
1
1
Tho
conten1s
ol
lhe
I
F
re91
s1
er
are
sent
on
the
data
bus.
0
Tt:c contents ot
the
data
bus
afc
sto
red
in Ult)
I
1
0
0
OOA
register.
1
The
co1
H('n1s
ot
tho
O
DA
rogis:or
ar·
c
scot
on
the
dato
b
vs.
0
l
hc
cootcnts
of
the
data
b us
an~
s101
ed
io
t11c
1
1
0
0
00
f0£'iS1Cf.
I
1
The
contents
o
t
t
he
0
0
9
fegis1ct
are
sent
o
n
the
Cata
bus.
0
T!H~
co
nh?nts
OI
llH? data
bus
are
s~or
ed
Ul
Ult?
I
1
1
0
OPA
f
Cgis;ct.
1
The
contents
of
t
he
PAi
a
re
sent o
n
the data b
us.
0
i
'hc
coo
tents or
the d
ata
bus
a
re
stored
1
n
the
OP8
registef.
I
1
,
1
,
ltl
c
con1en1
s ol
the PBi
a
re
sen1 on
the
d(-ila
b
us.
74
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