User manual

17 The ENDAT-7100M System Board

2-6. Digital I/O

1) Pin out of digital I/O header (JP7):

Pin No. Function Pin No. Function

1 +5V 2 +5V

3 DIO-O0 4 DIO-I0

5 DIO-O1 6 DIO-I1

7 DIO-O2 8 DIO-I2

9 DIO-O3 10 DIO-I3

11 DIO-O4 12 DIO-I4

13 DIO-O5 14 DIO-I5

15 GND 16 GND

17 DIO-O6 18 DIO-I6

19 DIO-O7 20 DIO-I7

21 +3.3V 22 +3.3V

2) Digital I/O port address:

This function is support by onboard super I/O chip; it can be control easily by

change the register of super I/O chip via I/O port “4Eh” and “4Fh”. Please

see the sample code of below for implement.

Voltage tolerance: +/- 5% with 0V to +5V.

Sample code for input (using Turbo C/C++ 3.0):

#define input_port 0x4f

outportb(0x4e,0x87); //Unlock register

outportb(0x4e,0x07); //Set Logic Device number pointer

outportb(0x4f,0x09); //Set Logic Device number

outportb(0x4e,0xF1); // Set active register is CRF1

read_data=inportb(input_port); // Read digital input data

printf("DIO-Input=%02X\n",read_data); //Show digital input data on screen

Bit No 7 6 5 4 3 2 1 0

Map IN7 IN6 IN5 IN4 IN3 IN2 IN1 IN0