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KTD-S0002-I Page 29 Digital I/O Interface

pITX-SP User's Guide

13.3 Connector Redirection

When the board is shipped the digital I/O pins are routed to a 10 pin Molex connector on the RTC battery

module.

The digital I/O interface is available through the Molex connector J2 (10 pins).

Header Pin Signal Name Function

VCC

Power +3.3V

2 GPIO4 Bidirectional I/O 4

3 GPIO0 Bidirectional I/O 0

4 GPIO5 Bidirectional I/O 5

5 GPIO1 Bidirectional I/O 1

6 GPIO6 Bidirectional I/O 6

7 GPIO2 Bidirectional I/O 2

8 GPIO7 Bidirectional I/O 7

9 GPIO3 Bidirectional I/O 3

10 GND Ground

13.4 Special I/O Modes

The special I/O modes are not available before hardware revision 4.00 (PCB revision).

13.4.1 IRQ Mode

All eight I/O lines can be configured to trigger an interrupt on the falling edge of the signal. However for

the interrupt handling only IRQ7 is available even when more lines are used. This allocation cannot be

modified. If more IRQs should be used the identification of the source must be done by sampling the input

pins.

Attention: Set the entry Advanced/Onboard DeviceConfiguration/Chipset Configuration/Serial IRQ Mode to Continuous.

13.4.2 Tri-State Mode

In tri-state mode the pins are automatically configured as output pins. In contrast to a standard ouput pin

the tri-state pin can also be used as an input pin (i.e. acknowledge from I2C-Bus).

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