OLIMEX A20-MICRO-E16GS16 [41/55] Gpio 3 general purpose input output 40pin connector

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-3 connector

GPIO pin# Signal name Processor pin# GPIO pin# Signal name Processor pin#

1 5V - 2 GND -

3 3.3V - 4 GND -

5 PH0 A6 6 PB3 B14

7 PH2/LED C6 8 PB4 A13

9 PH7 B4 10 PB5 B13

11 PH9 D4 12 PB6 A12

13 PH10 A3 14 PB7 B12

15 PH11/SDC3-DET# B3* 16 PB8/SATA-PWR-EN A11

17 PH12 C3 18 PB10 C11

19 PH13 A2 20 PB11 C10

21 PH14 B2 22 PB12 C9

23 PH15 A1 24 PB13 B11

25 PH16 B1 26 PB14 A10

27 PH17 C1 28 PB15 B10

29 PH18 C2 30 PB16 A9

31 PH19 D1 32 PB17 B9

33 PH20 D2 34 PH24 E3

35 PH21 D3 36 PH25 E4

37 PH22 E1 38 PH26 F3

39 PH23 E2 40 PH27 F4

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

Page 41 of 55