Chapter
2 Register
Map and Descriptions
©
National Instruments Corporation
2-5
Static DIO Register-Level Programmer Manual
IO Select Registers
IOSelect(
N
)
This register configures bidirectional port
N
as input or output, where
N
is the port number in
hexidecimal.
Note
Ports can range from 0 to 11 (0x0 to 0xB), depending on your device. For each port,
you must add an additional offset equal to 0x10 time the port number in hex.
Address Offset:
0x41 + 0x(
N
)0
Type:
Read-write
Size:
8-bit
Bit Map:
Bit
Name
Description
7–1
Reserved
Write only zeros to these bits.
0
I(1) / O(0)
Write a 0 for input or a 1 for output.
Note
It is not necessary to set this register if your device only supports fixed direction
ports.
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
I(1) / O(0)
