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Port c register – National Instruments Low-Cost Multifunction I/O Board for ISA Lab-PC+ User Manual

Page 152

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Register Map and Descriptions

Appendix D

Lab-PC+ User Manual

D-36

© 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 in Appendix E, Register-Level Programming, for a
description of the individual bits in the Port C Register.

Address:

Base address + 12 (hex)

Type:

Read-and-write

Word Size:

8-bit

Bit Map:

7

6

5

4

3

2

1

0

D7

D6

D5

D4

D3

D2

D1

D0

Bit

Name

Description

7-0

D<7..0>

8-bit Port C data.