參數(shù)資料
型號： M38503E4SS
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機
文件頁數(shù)： 23/86頁
文件大小： 1193K
代理商： M38503E4SS
23
3850 Group (Spec. H)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
(2) Asynchronous Serial I/O (UART) Mode
Clock asynchronous serial I/O mode (UART) can be selected by
clearing the serial I/O1 mode selection bit (b6) of the serial I/O1
control register to
“
0
”
.
Eight serial data transfer formats can be selected, and the transfer
formats used by a transmitter and receiver must be identical.
The transmit and receive shift registers each have a buffer, but the
two buffers have the same address in memory. Since the shift reg-
ister cannot be written to or read from directly, transmit data is
written to the transmit buffer register, and receive data is read
from the receive buffer register.
The transmit buffer register can also hold the next data to be
transmitted, and the receive buffer register can hold a character
while the next character is being received.
Fig. 20 Block diagram of UART serial I/O1
X
I
N
1
/
4
O
r
E
e
P
E F
E
1
/
1
6
1
/
1
6
D
a
t
a
b
u
s
R
c
e
t
i
c
o
e
n
i
v
b
e
i
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
R
e
e
c
c
e
e
i
i
v
v
e
e
b
i
n
u
t
f
e
f
e
r
r
u
f
p
u
l
l
r
f
e
l
a
q
g
u
e
(
R
s
B
(
F
R
)
I
r
t
t
)
Baud rate generator
Address 001C
16
F
r
e
q
u
e
n
c
y
d
i
v
i
s
i
o
n
r
a
t
i
o
1
/
(
n
+
1
)
S
T
/
S
P
/
P
A
g
e
n
e
r
a
t
o
r
Transmit buffer register
D
a
t
a
b
u
s
T
r
a
n
s
m
i
t
s
h
i
f
t
r
e
g
i
s
t
e
r
Address
0018
16
Transmit shift completion flag (TSC)
T
r
a
n
s
m
i
t
b
u
Address
0019
16
f
f
e
r
e
m
p
t
y
f
l
a
g
(
T
B
E
)
Transmit interrupt request (TI)
ST detector
SP detector
UART control register
A
d
d
r
e
s
s
0
0
1
B
1
6
C
h
a
r
a
c
t
e
r
l
e
n
g
t
h
s
e
l
e
c
t
i
o
n
b
i
t
A
d
d
r
e
s
s
0
0
1
A
1
6
B
R
G
c
o
u
n
t
s
o
u
r
c
e
s
e
l
e
c
t
i
o
n
b
i
t
Transmit interrupt source selection bit
Serial I/O1 synchronous clock selection bit
Clock control circuit
C
h
a
r
a
7 bits
8
b
c
t
e
l
n
g
t
h
s
e
l
e
t
i
t
s
Serial I/O1 control register
P
2
6
/
S
C
L
K
Serial I/O1 status register
P
2
4
/
R
X
D
P
2
5
/
T
X
D
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M38503M4A-210SP 制造商:Renesas Electronics Corporation 功能描述:
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