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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3825 Group
28
SERIAL I/O
Serial I/O can be used as either clock synchronous or asynchro-
nous (UART) serial I/O. A dedicated timer (baud rate generator) is
also provided for baud rate generation.
(1) Clock Synchronous Serial I/O Mode
Clock synchronous serial I/O mode can be selected by setting the
mode selection bit of the serial I/O control register to 1.
For clock synchronous serial I/O, the transmitter and the receiver
must use the same clock. If an internal clock is used, transfer is
started by a write signal to the TB/RB (address 0018
16).
Fig. 23 Block diagram of clock synchronous serial I/O
Fig. 24 Operation of clock synchronous serial I/O function
P
4
6/
S
C
L
K
P
4
7/
S
R
D
Y
P
4
4/
R
X
D
P
45/
T
X
D
f
(
X
I
N
)
1
/
4
1/4
F
/
F
S
e
r
i
a
l
I
/
O
s
t
a
t
u
s
r
e
g
i
s
t
e
r
Serial I/O control register
R
e
c
e
i
v
e
b
u
f
f
e
r
r
e
g
i
s
t
e
r
A
d
d
r
e
s
s
0
0
1
8
1
6
Receive shift register
R
ece
i
ve
b
u
ff
er
f
u
ll
fl
ag
(RBF)
R
e
c
e
i
v
e
i
n
t
e
r
r
u
p
t
r
e
q
u
e
s
t
(
R
I
)
Clock control circuit
S
h
i
f
t
c
l
o
c
k
S
er
i
a
l
I
/
O
sync
h
ron
i
zat
i
on
clock selection bit
Frequency division ratio 1/(n+1)
B
a
u
d
r
a
t
e
g
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n
e
r
a
t
o
r
Add
ress 001
C
16
BRG
count source se
l
ect
i
on
bi
t
Clock control circuit
F
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n
g
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D
ata
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us
Add
ress 001816
S
h
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k
T
ransm
i
t s
hif
t reg
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ster s
hif
t comp
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et
i
on
fl
ag
(TSC)
T
ransm
i
t
b
u
ff
er empty
fl
ag
(TBE)
T
ransm
i
t
i
nterrupt request
(TI)
T
ransm
i
t
i
nterrupt source se
l
ect
i
on
bi
t
A
d
d
r
e
s
s
0
0
1
9
1
6
D
ata
b
us
A
d
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s
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1
A
1
6
T
r
a
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m
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(
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(
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D
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
RBF
= 1
TSC = 1
T
B
E
=
0
TBE
= 1
TSC = 0
T
r
a
n
s
f
e
r
s
h
i
f
t
c
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k
(
1
/
2
t
o
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0
4
8
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x
t
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)
S
er
i
a
l
output
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X
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i
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W
r
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g
i
s
t
e
r
(
a
d
d
r
e
s
s
0
0
1
8
1
6)
O
verrun error
(OE)
detection
N
o
t
e
s
1
:
T
h
e
t
r
a
n
s
m
i
t
i
n
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r
r
u
p
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(
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)
c
a
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m
p
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d
(
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B
E
=
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)
o
r
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r
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t
r
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r
a
t
i
o
n
h
a
s
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n
d
e
d
(
T
S
C
=
1
)
,
b
y
s
e
t
t
i
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g
t
h
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t
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a
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(
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/
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c
o
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r
.
2
:
I
f
d
a
t
a
i
s
w
r
i
t
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e
n
t
o
t
h
e
t
r
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i
t
b
u
f
f
e
r
r
e
g
i
s
t
e
r
w
h
e
n
T
S
C
=
0
,
t
h
e
t
r
a
n
s
m
i
t
c
l
o
c
k
i
s
g
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n
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r
a
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d
c
o
n
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i
n
u
o
u
s
l
y
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n
d
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e
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a
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t
a
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o
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t
p
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t
c
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t
i
n
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o
u
s
l
y
f
r
o
m
t
h
e
T
XD
p
i
n
.
3
:
T
h
e
r
e
c
e
i
v
e
i
n
t
e
r
r
u
p
t
(
R
I
)
i
s
s
e
t
w
h
e
n
t
h
e
r
e
c
e
i
v
e
b
u
f
f
e
r
f
u
l
l
f
l
a
g
(
R
B
F
)
b
e
c
o
m
e
s
1
.
D
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
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