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Register-Level Programming Chapter 4
Lab-NB User Manual 4-28 © National Instruments Corporation
Port C Register
Port C is special in the sense that it can be used as an 8-bit I/O port like port A and port B if
neither port A nor port B is used in handshaking (latched) mode. If either port A or port B is
configured for latched I/O, some of the bits in port C are used for handshaking signals. See
Programming the Digital I/O Circuitry later in this chapter for a description of the individual bits
in the Port C Register.
Address: Slot starting address + 5 0020 (hex)
Type: Read-and-write
Word Size: 8-bit
Bit Map:
76543210
D7 D6 D5 D4 D3 D2 D1 D0
Bit Name Description
7–0 D<7..0> Data Bit—8-bit port C data.