Figure 16: External RTC Reference Schematic
2.9.3 Unused I
2
C Signal Termination
All unused I
2
C can be left unconnected if the corresponding I
2
C port is switched off in software.
Otherwise, it is recommended to keep the pull-up resistors available. Unused I
2
C signals can be
configured to be GPIO.
2.10 UART
The Colibri module form factor features three UART interfaces. Even though the UART_A is
specified as full-featured UART, some modules might not provide all the control signals. Please
read the corresponding datasheet of the module carefully. UART_A is the standard console output
interface for the Linux and Windows Embedded Compact operating system. It is desirable to keep
at least the RX and TX signals of this port accessible for system debugging.
UART_B features RTS and CTS signals for hardware flow control, while UART_C does not feature
any flow control signals. Some modules might provide the additional flow control signals on non-
standard pins.
2.10.1 UART Signals
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