m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 258
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m37905
Manufacturer Part Number
m37905
Description
Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M37905.pdf
(565 pages)
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11.2 Block description
Figure 11.2.1 shows the block diagram of serial I/O. Registers relevant to serial I/O are described below.
Fig. 11.2.1 Block diagram of serial I/O
CTS
CTS
i
i
/RTS
/CLK
RxD
i
i
n: Values set in UARTi baud rate register (BRGi)
i
f
512
f
f
16
64
f
2
BRG count source
select bits
CLK
CTS
Clock synchronous
(internal clock selected)
i
i
1 / (n+1)
BRGi
7905 Group User’s Manual Rev.1.0
1/16
1/16
1/2
(external clock selected)
(internal clock selected)
synchronous
synchronous
Clock synchronous
Clock synchronous
UART
Clock
UART
Clock
Transmit control
control circuit
Receive
0
circuit
0
0
0
0
0
Data bus (odd)
Data bus (even)
0 D
Transfer clock
Transfer clock
D
8
8
UARTi transmit register
D
UARTi receive register
7
D
7
D
11.2 Block description
6
D
6
Bit converter
D
Bit converter
Data bus (even)
Data bus (odd)
5
D
5
D
4
D
D
4
3
D
3
SERIAL I/O
D
UARTi transmit
buffer register
2
D
UARTi receive
buffer register
2
D
1
D
D
1
0
D
0
TxD
11-3
i
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