CyberResearch PCIDIO 24H, PCIDIO 48H, PCIDIO 96H 4.1.6 Power on Configuration, 4.1.7 Note for Output Data, PORT, PORT, Word, UPPER, LOWER, PORT C, PORT C, Control, BE SURE TO, 24 ∙ Operation Theorem

Control	D	D	D	D	PORT	PORT C	PORT	PORT C
Word	4	3	1	0	A	UPPER	B	LOWER
00H	0	0	0	0	O/P	O/P	O/P	O/P
01H	0	0	0	1	O/P	O/P	O/P	I/P
02H	0	0	1	0	O/P	O/P	I/P	O/P
03H	0	0	1	1	O/P	O/P	I/P	I/P
08H	0	1	0	0	O/P	I/P	O/P	O/P
09H	0	1	0	1	O/P	I/P	O/P	I/P
0AH	0	1	1	0	O/P	I/P	I/P	O/P
0BH	0	1	1	1	O/P	I/P	I/P	I/P
10H	1	0	0	0	I/P	O/P	O/P	O/P
11H	1	0	0	1	I/P	O/P	O/P	I/P
12H	1	0	1	0	I/P	O/P	I/P	O/P
13H	1	0	1	1	I/P	O/P	I/P	I/P
18H	1	1	0	0	I/P	I/P	O/P	O/P
19H	1	1	0	1	I/P	I/P	O/P	I/P
1AH	1	1	1	0	I/P	I/P	I/P	O/P
1BH*	1	1	1	1	I/P	I/P	I/P	I/P

Table 4.2 Summary of control word (D0 - D4)

(* power on default configuration)

4.1.6 Power on Configuration

The default configuration after power on, hardware reset or software reset sets all ports as input ports, and therefore, users don’t have to worry about damaging the external devices when system is power on. In addition, the default signal level can be pulled high or pulled low by setting the jumpers. Refer to section 2.7 for setting the power on status of the DIO ports.

4.1.7 Note for Output Data

Be careful of the initial condition of digital output signals. If users set the control word as output port after power on, the previous uncertain output value will be put on the output pins immediately. Therefore, BE SURE TO

WRITE A SAFE VALUE TO THE PORTS BEFORE CONFIGURING THEM AS OUTPUT PORTS.

24 ∙ Operation Theorem