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Control Words
I/O Configuration
CWnD0
Port C1 lower nibble (bits 0-3)
CWnD1
Port B1
CWnD2
CWnD3
Port C1 upper nibble (bits 4-7)
CWnD4
Port A1
CWnD5
CWnD6
CWnD7
Control Word (X = 0)
7
6
5
4
3
1
X
X
0
0
1
X
X
0
0
1
X
X
0
0
1
X
X
0
0
1
X
X
0
1
1
X
X
0
1
1
X
X
0
1
1
X
X
0
1
1
X
X
1
0
1
X
X
1
0
1
X
X
1
0
1
X
X
1
0
1
X
X
1
1
1
X
X
1
1
1
X
X
1
1
1
X
X
1
1
Sealevel Systems PIO-24.PCI
1 = input
1 = input
0 or 1 (no effect)
1 = input
1 = input
0 or 1 (no effect)
0 or 1 (no effect)
Always a 1
Figure 10-I/O Configuration
Hex Value
2
1
0
X
0
0
80
X
0
1
81
X
1
0
82
X
1
1
83
X
0
0
88
X
0
1
89
X
1
0
8A
X
1
1
8B
X
0
0
90
X
0
1
91
X
1
0
92
X
1
1
93
X
0
0
98
X
0
1
99
X
1
0
9A
X
1
1
9B
Figure 11-Control Word, Port Setup
Technical Description
0 = output
1 on power up
0 = output
1 on power up
0 = output
1 on power up
0 = output
1 on power up
Port Setup
A
B
C Upper
Out
Out
Out
Out
Out
Out
Out
In
Out
Out
In
Out
Out
Out
In
Out
Out
In
Out
In
In
Out
In
In
In
Out
Out
In
Out
Out
In
In
Out
In
In
Out
In
Out
In
In
Out
In
In
In
In
In
In
In
C Lower
Out
In
Out
In
Out
In
Out
In
Out
In
Out
In
Out
In
Out
In
Page 15
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