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Functional Overview 
2.3 Serial Port Interface 
Rev.1.0 Dec 15, 2006 
2-4
REJ10J0917-0100 
 
 
 
2 
2.3 Serial Port Interface 
 
The SH7149 included in the M3A-HS49 contains a UART module. In the M3A-HS49, SCI channel 1 is connected to 
J3 (Serial Port connector). Switch the connection of the J3 connector and J14 connector by the jumper (JP3, JP4) 
setting.  
Figure2.3.1 shows the block diagram of serial port interface in the M3A-HS49. 
 
 
SH7149
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 (J3)
RS232C
Driver
Extension Connector (J14)
RXD1(PA3)
TXD1(PA4)
1
2
3
1
2
3
JP4
JP3
 
 
Figure2.3.1 Block Diagram of Serial Port Interface