參數(shù)資料
型號： M38047M8-XXXFP
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(jī)
文件頁數(shù)： 50/135頁
文件大小： 2055K
代理商： M38047M8-XXXFP
50
3803/3804 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
SERIAL I/O
Serial I/O1
Serial I/O1 can be used as either clock synchronous or asynchro-
nous (UART) serial I/O. A dedicated timer is also provided for
baud rate generation.
(1) Clock Synchronous Serial I/O Mode
Clock synchronous serial I/O1 mode can be selected by setting
the serial I/O1 mode selection bit of the serial I/O1 control register
(bit 6 of address 001A
16
) 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 transmit/receive buffer register.
Fig. 40 Block diagram of clock synchronous serial I/O1
Fig. 41 Operation of clock synchronous serial I/O1
1/4
1
/
4
F/F
P
4
6
/
S
C
L
K
1
Serial I/O1 status register
Serial I/O1 control register
P4
7
/S
RDY1
P4
4
/R
X
D
1
P4
5
/T
X
D
1
Receive buffer register 1
Address 0018
16
R
e
c
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v
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s
h
i
f
t
r
e
g
i
s
t
e
r
1
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Clock control circuit
Shift clock
Serial I/O1 synchronous
clock selection bit
Frequency division ratio 1/(n+1)
Baud rate generator 1
Address 001C
16
B
R
G
c
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u
n
t
s
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b
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Clock control circuit
F
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-
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Transmit buffer register 1
Data bus
Address 0018
16
Shift clock
Transmit shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Address 0019
16
Transmit interrupt request (TI)
Transmit interrupt source selection bit
D
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f(X
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)
(f(X
CIN
) in low-speed mode)
D
7
D
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
0
D
1
D
2
D
3
D
4
D
5
D
6
R
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=
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1
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(
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)
Overrun error (OE)
detection
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:
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