NuDAQ PET-48DIO, Руководство пользователя, Страница: 27 / 38

Control Programming
•
21
Config.
Value
D4 D3 D1 D0 PORTA
PORT C
UPPER
PORT B
PORT C
LOWER
80H 0 0 0 0 O/P O/P O/P O/P
81H 0 0 0 1 O/P O/P O/P I/P
82H 0 0 1 0 O/P O/P I/P O/P
83H 0 0 1 1 O/P O/P I/P I/P
88H 0 1 0 0 O/P I/P O/P O/P
89H 0 1 0 1 O/P I/P O/P I/P
8AH 0 1 1 0 O/P I/P I/P O/P
8BH 0 1 1 1 O/P I/P I/P I/P
90H 1 0 0 0 I/P O/P O/P O/P
91H 1 0 0 1 I/P O/P O/P I/P
92H 1 0 1 0 I/P O/P I/P O/P
93H 1 0 1 1 I/P O/P I/P I/P
98H 1 1 0 0 I/P I/P O/P O/P
99H 1 1 0 1 I/P I/P O/P I/P
9AH 1 1 1 0 I/P I/P I/P O/P
9BH 1 1 1 1 I/P I/P I/P I/P
Table 3.1 Summarize of control word (D0 - D4) and mode state
(Mode 0 - Mode 15)
3.3 Register Structure
The PET-48DIO needs two bytes of I / O address to operate, the first
byte is ports'
index select and the second byte is ports' data
read/write .
Index
Select: The register is used to define the index of I/O ports.
You have to define this value before you read or write
data to the I/O port of PET-48DIO. Please refer the I/O
port's index values in table 3.2.
Data Read/
Write : This register is used to read or write data to the
correspond I/O port which you have defined in the
Index Select register.