Quick Start Manual
Page 9
Figure 9: Wi-Fi communication hardware layout and signals
Bluetooth HCI is connected to USART6 of the microcontroller. Cross connection of TX/RX and RTS/CTS lines
must be observed according to the following diagram.
Figure 10: Bluetooth communications hardware layout and signals
Bluetooth and Wi-Fi both have their own select/enable line. An interrupt line is also provided for Wi-Fi.
The Koala EVM board provides level translation and slow clock for interfacing to the attached COM8 module.
Output to ClarinoxDebugger is provided through USART2 of the microcontroller. ClarinoxDebugger is a powerful
GUI tool for remotely debugging ClarinoxSoftFrame-based applications. For more information on the debugger,
refer to the ClarinoxDebugger user manual.
MCU
WL module
SDIO_D0:3
WL_EN
WL_IRQ
SDIO_CMD
SDIO_CLK
Slow Clock
32.768 kHz
1.8v regulator
VIO
3.3v supply
Vbat
Volt
age
T
ran
s
lat
or
MCU
BT module
Rx
BT_EN
Slow Clock
32.768 kHz
1.8v regulator
VIO
3.3v supply
Vbat
Tx
Rx
Tx
RTS
RTS
CTS
CTS
Volt
age
T
ran
s
lat
or
