CPC314
C P C 3 1 4 U s e r M a n u a l
41
© 2 0 2 1 F a s t w e l V e r . 0 0 1
Table 2-6
– Purpose of GPIO ports
I/O port line
I/O port line
direction
Description
GPIO_P0 [7:0]
Input /
Output
Reserved.
The lines are used for COM1 port (RS-232).
GPIO_P1 [7:0]
Input /
Output
Reserved.
The lines are used for COM2 port (RS-232).
GPIO_P2 [7:0]
Input /
Output
Reserved.
GPIO port (XP2)
GPIO_P3 [3:0]
Input /
Output
SPI interface. FRAM 64 Kb.
GPIO_P3 [5:4]
Input /
Output
I2C0 interface. Temperature sensor.
GPIO_P3 [6]
Output
LVDS Shutdown
Not used.
GPIO_P3 [7]
Output
LVDS PowerON
Switching on the +3.3 V power supply of LVDS panel.
Not used.
GPIO_P4 [7:0]
Input /
Output
Serial port serial 1 of the processor (RS-422/485, COM3).
GPIO_P5 [7:0]
Input /
Output
Serial port serial 2 of the processor (RS-422/485, COM4).
GPIO_P6 [7:0]
Input /
Output
SD0 port. Connection of microSD card.
GPIO_P7 [0]
Output
Control of HL5 LED (red), active level ‘0’.
GPIO_P7 [1]
Output
Control of HL5 LED (green
), active level ‘0’.
GPIO_P7 [2]
Input
Short circuit flag over USB ports. Active level '0'.
GPIO_P7 [3]
Input
Short circuit flag over +3.3V voltage connected to the PCI/104 (PCI bus 32 bit). Active
level '0'.
GPIO_P7 [4]
Input
3V lithium battery low flag. Active level '0'.
GPIO_P7 [5]
Input
External opto-isolated reset / interrupt. Active level '0'. Triggered in case of the voltage
on XP18 connector from 3 to 5.5 V.
GPIO_P7 [6]
Input
Resetting BIOS Setup settings by closing jumper X1. Active level '0'.
GPIO_P7 [7]
Input
User switch X2. Active level '0'.
GPIO_P8[7:0]
Input /
LPT port
