Product specifications

Pin
Signal
Selectable
Pin
Signal
Selectable
23
IIC SCL
24
3.3V
25
IIC SDA
26
RESET-
As discussed in the previous section, GPIOs 3 through 8 are set by default for special functions such as
modem controls. To use GPIOs 3 through 8 as normal GPIOs, you must place a jumper between JP7
and JP8 for the specific GPIO as described in the previous section. GPIO 2 can also have a special
function if SPI mode is selected for the LCD display via header JP12 as described in the LCD Interface
section later in this chapter.
Table 10 General Purpose I/O Signal Descriptions
Silex
S3C2412
I/O
Special Function
GPIO_0
GPF 0
O
GPIO_1
GPF 1
O
GPIO_2
GPF 2
O
Special function SPI_CS- for LCD display
GPIO_3
GPF 3
O
Special function TEMP_CS SPI temperature sensor enable
GPIO_4
GPF 4
O
Special function, nDTR0
GPIO_5
GPF 5
I
Special function, nDSR0
GPIO_6
GPF 6
I
Special function, nDCD0
GPIO_7
GPF 7
O
Special function, nLED_3; wired link
GPIO_8
GPG 5
O
Special function, nLED_2; wireless link
GPIO_9
GPG 6
O
nLED_1; power on/status*
GPIO_10
GPG 7
I
Switch Input; 1 = off, 0 = switch depressed*
*The functionality of GPIO_9 and GPIO_10 cannot be changed by the user.