R8C/3MK Group
USB-to-Serial Communication Conversion Demo Board
R0K5R8C3MDU30BR Instruction Manual
R01AN1051EJ0100 Rev.1.00
Page 15 of 38
Mar 21, 2012
8. Operating
Instructions
Application software for USB-to-Serial communication conversion has been installed in the MCU flash ROM
mounted on this demo board. The serial driver at shipping is UART function. You can use USB-to-UART
conversion.
This product also implements the downloader function via USB to update application software. If the user
updates the upgrade USB-to-serial communication conversion application software released individually
(Refer to 8.3), it is possible to communicate not only the UART device but also the I
2
C devices or the 4-wire
bus communication device (hereinafter called SSU device) to SSU in the R8C/3MK MCU.
As shown in
Figure 9, if TP1 of this product is open when power is turned on, the application runs as the USB-
to-serial communication conversion function. When TP1 is short to “GND”, the USB download function is
enabled. Refer to ”7.3 External Serial Device Connection” for the detail about the connection with the external
serial communication device.
Figure 9 Close-up of TP1 on Circuit Board
8.1
USB-to-UART Communication Conversion Function (pre-installed version)
.
Application software for USB–to-UART communication conversion has been installed at shipping.
shows the switching sequence between the USB-to-UART communication conversion function and USB
downloader function
Figure 10 USB-to-UART Communication Function / USB Downloader Function Switching Sequence
Turn on power
Confirm
TP1state
USB
downloader
function
USB–to-UART
communication
conversion function
TP1 = GND
TP1 = Open
