Serial I/O Interface - Renesas 32185 User Manual

2.4

Serial I/O Interface

The evaluation board is interfaced to the host PC (Windows) through its RS-232C by using SIO of
the M32R/ECU. Of the RS-232C control signals, only TXD and RXD are used for connection to the
host PC (Windows). The unused CTS and RTS are directly-coupled to configure a loop-back. The
unused DSR and DTR also are configured in a similar manner.
The serial I/O interface is configured in such a way that only one serial I/O channel can be used at a
time.
Any of the four channels 0–3 can be selected using a rotary switch.
CN5
XM2C-0912
TXD
RXD
DTR
DSR
CTS
RTS
U7
TC74VHC138FT
Y0
Y3
Y1
Y2
A B C
SW2
DR-KR10H
* CNx,CONx : Connector
* Jx : Jumper
* SWx : Switch
* Ux : IC
Figure 2.4 Serial I/O Interface
REJ10B0223-0150/Rev.1.50
U8
QS21X384Q1G
U9
MAX3232CSE+
TXD
RXD
CON2
FX1-144S-1.27DS
CON1
FX1-144S-1.27DS
32185/32186/32192/32195/32196 Group
Starter Kit User's Manual M3A-2154G52B
TXD0
TXD1
TXD2
TXD3
J15
RXD0
2
J18
RXD1
2
J19
RXD2
2
J20
RXD3
2
P83
P86
P175
P82
P85
P174
P74
P75
Mar 2008
U1
M32R/ECU
P82/TXD0/TO26
P85/TXD1/TO23
P174/TXD2/TO28
P74/RTDTXD/
TXD3/NBDD0
3
P83/RXD0/
TO25
1
3
P86/RXD1/TO22
1
3
P175/RXD2/TO27
1
3
P75/RTDRXD/
RXD3/NBDD1
1
CN4
XG4C-1434
NBDD0
NBDD1
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