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Registers Format
I/O Address Read Write
Base + 0 Counter 0 Counter 0
Base + 4 Counter 1 Counter 1
Base + 8 Counter 2 Counter 2
Base + C ------------- 8254 Counter
Control
Base + 10 A/D Data Reg. CH1 D/A Data
Reg.
Base + 14 ------------- CH2 D/A Data
Reg.
Base + 18 A/D Status
Reg.
A/D Control Reg.
Base + 1C Digital IN Reg. Digital OUT Reg.
Base + 20 ------------- Software Trigger
Table 3.1 I/O Address
3.2 A/D Data Registers
The PCI-9112 provides 16 single-ended or 8 differential A/D input
channels, the digital data will store in the A/D data registers. The 12 bits
A/D data is put into 32 bits registers.
Address : BASE + 10
Attribute : read only
Data Format:
Bit 7
6
5
4
3
2
1
0
BA
SE+
10
A
D
3
A
D
2
A
D
1
A
D
0
C
H
3
C
H
2
C
H
1
C
H
0
BA
SE+
11
A
D
1
1
A
D
1
0
A
D
9
A
D
8
A
D
7
A
D
6
A
D
5
A
D
4
BA
SE+
12
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
BA
SE+
13
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
AD11 .. AD0 : Analog to digital data. AD11 is the Most
Significant Bit (MSB). AD0 is the Least Significant Bit (LSB).
CH3 ~ CH0 : A/D channel number from which the data is derived.
--- : Don‘t care