Renesas RX23T Series, Руководство пользователя

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RSKRX23T 5. User Circuitry
R20UT3318EG0100
Rev.
1.00
Page 21 of 40
Aug 24, 2015
5.7 USB Serial Port
A USB serial port is implemented in a Renesas low power microcontroller (RL78/G1C) and is connected to the
RX23T Serial Communications Interface (SCI) module. Multiple options are provided to allow the selection of
the connected SCI1 port. Connections between the USB to Serial converter and the microcontroller are listed
in
Table 5-6 below.
Signal Name Function
MCU
Port Pin
TXD1 SCI1 Transmit Signal PD3 16
RXD1 SCI1 Receive Signal PD5 14
TXD5*
1
SCI5 Transmit Signal PB5 19
RXD5*
1
SCI5 Receive Signal PB6 18
RS232TX *
1
External SCI Transmit Signal - -
RS232RX *
1
External SCI Receive Signal - -
RL78G1CCTS Clear To Send PB4 21
RL78G1CRTS Request to Send PD7 12
Table 5-6: Serial Port Connections
*
1
: This connection is a not available in the default RSK configuration - refer to §6 for the required
modifications.
When the RSK board is first connected to a PC running Windows with the USB/Serial connection, the PC will
look for a driver. This driver is installed during the installation process, so the PC should be able to find it. The
PC will report that it is installing for a driver and then report that a driver has been installed successfully, as
shown in
Figure 5-2 . The exact messages may vary depending upon operating system.
Figure 5-2: USB-Serial Windows Installation message
5.8 I
2
C Bus (Inter-IC Bus)
The RX23T features one I
2
C (Inter-IC Bus) interface modules. RIIC0 is connected to a 2Kbit EEPROM.
Specific details of the EEPROM device and the connections can be found in the board schematics.