Olimex Open Source Hardware Embedded ARM Linux Single board computer with dual core, dual GPU ALLWINNER A20 CORTEX-A7 with addi A20-OLINUXINO-MICRO-4GB 数据表
产品代码
A20-OLINUXINO-MICRO-4GB
OLIMEX© 2013
A20-OLinuXino-MICRO user's manual
6.1.2 UART0, UEXT1, UEXT2 interface
The UART0 might be used for UART communication by default. It is typically used for
serial/terminal debug. The UEXTs are typically used for connecting additional modules.
serial/terminal debug. The UEXTs are typically used for connecting additional modules.
Note that by default only UART0 is defined as a port suitable for serial debug. You can use our
USB-SERIAL-CABLE-F for debugging. UEXT1 and UEXT2 are NOT defined by default.
USB-SERIAL-CABLE-F for debugging. UEXT1 and UEXT2 are NOT defined by default.
Consider table below when connecting the USB-SERIAL-CABLE-F according to the wire color
code. The RX line of the cable (GREEN wire) should go to TX line of the target board; the TX line
of the cable (RED wire) should go to the RX line of the target board. The BLUE wire should go to
the target's GND line.
code. The RX line of the cable (GREEN wire) should go to TX line of the target board; the TX line
of the cable (RED wire) should go to the RX line of the target board. The BLUE wire should go to
the target's GND line.
UART0
Pin # Signal name
Processor pin
1 3.3V
-
2 UART0-TX
A7
3 UART0-RX
B7
4 GND
-
UEXT1
Pin #
Signal name
Pin # Signal name
1 3.3V
6
TWI2-SDA
2 GND
7
SPI2-MISO
3 UART6-TX
8
SPI2-MOSI
4 UART6-RX
9
SPI2-CLK
5 TWI2-SCK
10
SPI2-CS0
UEXT2
Pin #
Signal name
Pin # Signal name
1 3.3V
6
TWI1-SDA
2 GND
7
SPI1-MISO
3 UART7-TX
8
SPI1-MOSI
4 UART7-RX
9
SPI1-CLK
5 TWI1-SCK
10
SPI1-CS0
The UEXT connectors are used as an interface for the Olimex's UEXT modules (usually boards
with MOD- prefix in their commercial names). For more information on UEXT please visit:
with MOD- prefix in their commercial names). For more information on UEXT please visit:
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