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-1
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3-4.
Functions
3-4-1. Operation
1
/0
port controller operation
CS2
CS1
cso
RSJ
RS2 RS1
RSO
R/W
Operation
0
1
0
0 0
Resets
th
e divi
de
r internally
cont
ained
in
the 1/0
port
chip
.
0
1
0 1 1
Reads the contents of
th
e U register
and
sends
1hern
on
th
e data bus.
At
the samo time. the
receive fl
ag
RO
is reset.
0 1 1
0 0
Th
e
con
te
n
ts
of
t
he
data bus are conve
rt
ed
in
to a
serial data signal
of
s1art/ data/stop structure.
At
the same ti
me.
the transmit fl
ag
TD is
rese1.
0 1 1
0
t 1
1
0 The contents
of
the data
bus
are s
to
red in IM F
register.
0
The conte
nt
s
of
the data bus are s
tor
ed in
the
OPC register.
I 0 0 0
1 T
he
contents
of
the OPC regist
er
ar
e sent
on
t
he
da
ta
bus
.
0 The
con
tents
of
the data bus are stored in the G
1
0 0
re
gis
ter.
1
1
The contents
of
the G regist
er
are sent on
the
data bus.
0 The
co
nt
ents
of
the data
bus
are stored in the
1 0 1
MSK
regist
er
.
0
t T
he
co
nt
ents
of
the MSK r
eg
ister are sent
on
1
hc
data bus.
0 The conte
nt
s
of
th
e data bus are st
ore
d in the IF
1
0 1
re
gi
st
er
.
1
I
The
cont
ents
of
t
he
IF register are sent on t
he
data
bus.
0 The contents
of
th
e data bus
ar
e stored
in
the
DOA
re
gister.
1 1
0 0
1
The
co
nte
nt
s
of
the DOA register are sent
or>
the
data
bus
.
0 The conten
ts
of
the data bus are s
to
red in t
he
1 1
0
DOB register.
I
I
The
co
nte
nt
s
of
the DDB register a1e sent
on
the
data
bus
.
0
The cont
en
ts
of the data bus a1e stored
in
tile
1 1 1
0
OPA registe
r.
1 T
he
co
nt
ents o f
th
e
PAi
are sent on t
he
data bus.
0
The contents
of
t
he
da
ta
bus
are stored in the
OPB
register.
1
.,
1 1
1
T
he
contents
of
t
he
PBi are sent on the data bus.
74
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