6.3.2 JTAG ROW
The 6-signal JTAG interface at the board lacks a connector. The board has a JTAG row of pin holes.
Pin #
Signal name
1
RESET
2
TCK
3
TMS
4
TDO
5
TDI
6
GND
6.3.3 USB_OTG
Pin #
Signal name
1
+5V_OTG_PWR
2
D-
3
D+
4
USB_ID
5
GND
6.3.3 UEXT
The 10-pin UEXT connectors are typically mounted on Olimex boards. They pack three common
interfaces in a single connector – UART, I2C and SPI. You can use the UEXT connector to access
this interfaces easier (via jumper wires, for example).
You can also connect expansion modules to the UEXT connectors. More on UEXT might be found
here:
https://www.olimex.com/Products/Modules/UEXT/
Pin #
Wire name
1
3.3V
2
GND
3
RE8/U2TX
4
RE9/U2RX
5
RA2/SCL2
6
RA3/SDA2
7
RD14/SDI1(MISO1)
8
RD15/SDO1(MOSI1)
9
SCK1RD1/SCK1
10
RB15/#SS1
Page 20 of 26
