R8C/3MK Group
USB-to-Serial Communication Conversion Demo Board
R0K5R8C3MDU30BR Instruction Manual
R01AN1051EJ0100 Rev.1.00
Page 22 of 38
Mar 21, 2012
6) Outline of USB-to-SSU communication conversion
(1) Enter the confirmed COM number in the terminal software. As this function does not control UART
function, you do not need to set the communication speed, data length, etc.
(2) This demo board can communicate the external SSU device at 250kHz clock.
(3)The parameters in the SSU communication are the following.
This product can operate only as SSU master device (You can communicate with SSU slave device)
Data length: 8bit
Data transfer direction: MSB-first
SSCK clock phase: Change data at odd edge (Download data at even edge)
(4)This product can communicate with the external SSU device according the SSU demo communication
protocol.
Figure 22shows the example of the data communication with the EEPROM as the external SSU devices.
1. Write Command
"Renesas
”
2. Read Cpmmand
"12345"
SSU
Communication
Terminal software
Text screen
SSU Write
Command
Binary data
1. "Renesas
”
2. "12345"
SSU Read
Command
Binary data
SSU
US
B
US
B
USB
Communication
CDC Host
SSU
Communication
This Product
SS
U
SSU protocol
1. "Renesas
”
2. "12345"
SSU protocol
EE
PROM
Figure 22 Example of Data Communication using USB-to-SSU Communication Conversion
