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OLIMEX© 2015
6.11.2 GPIO-2 (General Purpose Input/Output) 40pin connector
The GPIO pins are led out on a separate 40pin connecter. They allow the user to attach additional
hardware, check readings or perform hardware debug. The GPIO-2 connector numbers are printed
at the bottom of the board for your convenience.
GPIO pin# Signal name
1
5V
3
3.3V
5
TWI0-SCK
7
TWI0-SDA
9
PI0
11
PI1
13
PI2
15
PI3
17
PI10
19
PI11
21
PC3/NCE1
23
PC7/NRB1
25
PC16
27
PC17
29
PC18
31
PC23
33
PC24/NQS
35
GPIO1
37
GPIO2
39
GPIO3
Signals marked with * are multiplexed with either a peripheral device or another connector. Ensure that the multiplexing is handled
properly on software and/or hardware level (else there would probably occur wrong levels, loss of data, etc).
GPIO-2 connector
Processor pin#
GPIO pin#
-
-
A15
B15
A20
B20
A19
B19
C17
D17
L22*
J22*
M21
F23
F22
G19
F21*
-
-
-
Page 40 of 56
A20-OLinuXino-MICRO user's manual
Signal name
2
GND
4
GND
6
PE0
8
PE1
10
PE2
12
PE3
14
PE4
16
PE5
18
PE6
20
PE7
22
PE8
24
PE9
26
PE10
28
PE11
30
PI14
32
PI15
34
UART0-RX
36
UART0-TX
38
NMI_N
40
RESET_N
Processor pin#
-
-
E23
E22
D23
D22
C23
C22
B23
B22
A23
A22
B21
A21
C15
D15
B7*
A7*
F5
C14
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