Usb Serial Port - Renesas RL78 Series User Manual

RSKRL78G1G
Pin Circuit Net Name
1 P17
2 P-SO00_TxD0
3 P-SI00_RxD0
4 P-SCK00
5 GROUND
6 Board_3V3
5.7

USB Serial Port

A USB serial port implemented in another Renesas low power microcontroller (RL78/G1C) is fitted on the RSK
to the microcontroller UART1. Multiple options are provided to allow re-use of the serial interface.
Connections between the USB to Serial converter and the microcontroller are listed in Table 5-6 below.
Serial Signal
*1
A-SO00_TxD0
*1
A-SI00_RxD0
TxD1
RxD1
*1
RS232TX
*1
RS232RX
*2
RL78G1C_CTS
*2
RL78G1C_RTS
*1
: This connection is a not available in the default RSK configuration - refer to §6 for the required
modifications.
*2
: CTS & RTS control is not supported on this RSK.
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.
R20UT3022EG0100 Rev. 1.00
Jan 15, 2015
Digilent Pmod™ Compatible Header Connections (PMOD2)
MCU
Port Pin
P17 24
P51 23
P50 22
P30 21
- -
- -
Table 5-5: Pmod™2 Header Connections (PMOD2)
Function
UART0 Transmit Signal
UART0 Receive Signal
UART1 Transmit Signal
UART1 Receive Signal
External RS232 Transmit Signal
External RS232 Receive Signal
Clear To Send
Request to Send
Table 5-6: Serial Port Connections
Figure 5-2: USB-Serial Windows Installation message
Pin Circuit Net Name
7 P-INTP4
P27
8
P-INTP0
9 P146
10 P147
11 GROUND
12 Board_3V3
5. User Circuitry
MCU
Port Pin
P31 16
P27 34
P137 6
P146 32
P147 33
- -
- -
MCU
Port Pin
P51 23
P50 22
P00 43
P01 42
- -
- -
P146 32
P147 33
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