Serial I/O Interface - Renesas 32176 User Manual

2.4

Serial I/O Interface

The evaluation board is interfaced to the host PC (DOS/V) 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 (DOS/V).
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.
Figure 2.4 Serial I/O Interface
REJ10B0224-0310/Rev.3.10
Starter Kit User's Manual M3A-2152
Mar. 2008
32176 Group
Page 49 of 83