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2.3 Serial Port Interface
Rev.1.0 July 21, 2006 2-4
REJ10J0952-0100
2
2.3 Serial Port Interface
The SH7125 included in the M3A-HS25 contains a UART module. In the M3A-HS25, the pins of SCI channel 0 or
SCI channel 1 can be connected to J2 (Serial Port connector). The pins of SCI channel 1 (RXD1(PA3) pin and TXD 1
(PA4)pin) are also connected to H-UDI connector, and extension connector (J5, J7). Switch the setting of the JP3 and
JP4 according to the connector used.
Figure2.3.1 shows the block diagram of serial port interface in the M3A-HS25.
SH7125
RXD1(PA3)
TXD1(PA4)
DCD
RxD
TxD
DTR
GND
DSR
RTS
CTS
RI
1
2
3
4
5
6
7
8
9
NC
GND
NC
Serial Port
connector (J2)
RS-232C
driver
1
2
3
JP4
JP3
RXD0(PE1)
1
2
3
TXD0(PE2)
Extension
connector（J5）
H-UDI
connector(J1）
Extension
connector（J7）
Figure2.3.1 Block Diagram of Serial Port Interface