Kontron pITX-SP - Manual (Page 34)

KTD-S0002-I Page 29 Digital I/O Interface
p ITX-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.
J2
The digital I/O interface is available through the Molex connector J2 (10 pins).
Header Pin Signal Name Function
1 VCC 1) 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
1
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).