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OLIMEX© 2015
6.11.3 GPIO-3 (General Purpose Input/Output) 40pin connector
GPIO-3 connector features the signals of AXP152 on a convenient header. The signals available
might be used to implement power controls on the board – for instance – turning off the device at
specific voltage level or detecting levels.
The JTAG signals might also be accessed at this header.
GPIO pin# Signal name
1
5V
3
3.3V
5
PH0
7
PH2/LED
9
PH7
11
PH9
13
PH10
15
PH11/SDC3-DET# B3*
17
PH12
19
PH13
21
PH14
23
PH15
25
PH16
27
PH17
29
PH18
31
PH19
33
PH20
35
PH21
37
PH22
39
PH23
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).
The yellow part of the table shows the JTAG signals.
These signals might be conveniently accessed on GPIO-3 connector. These JTAG signals might be
found at processor port PB. The pins of the connector are respectively GPIO-3 #26; GPIO-3 #28;
GPIO-3 #30; GPIO-4 #32. More specifically:
PB14 – MS0 (TMS) - GPIO-3 #26
PB15 – CK0 (TCK) - GPIO-3 #28
PB16 – DO0 (TDO) - GPIO-3 #30
PB17 – DI0 (TDI) - GPIO-4 #32
You would also need Vdd and GND which might be found on various places on the board. This
information should be sufficient to establish a hardware connection. The connection would depend
GPIO-3 connector
Processor pin#
GPIO pin#
-
-
A6
C6
B4
D4
A3
C3
A2
B2
A1
B1
C1
C2
D1
D2
D3
E1
E2
Page 41 of 56
A20-OLinuXino-MICRO user's manual
Signal name
2
GND
4
GND
6
PB3
8
PB4
10
PB5
12
PB6
14
PB7
16
PB8/SATA-PWR-EN
18
PB10
20
PB11
22
PB12
24
PB13
26
PB14
28
PB15
30
PB16
32
PB17
34
PH24
36
PH25
38
PH26
40
PH27
Processor pin#
-
-
B14
A13
B13
A12
B12
A11
C11
C10
C9
B11
A10
B10
A9
B9
E3
E4
F3
F4
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