User's Manual

Chapter 4 Register-Level Programming

Digital Control Register

The Digital Control Register can be used to configure port A, port B, and port C as inputs or

outputs as well as selecting simple mode (basic I/O) or handshaking mode (strobed I/O) for

transfers. See Programming the Digital I/O Circuitry later in this chapter for a description of the

individual bits in the Digital Control Register.

Address: Slot starting address + 5 0030 (hex)

Type: Read-and-write

Word Size: 8-bit

Bit Map:

76543210

CW7 CW6 CW5 CW4 CW3 CW2 CW1 CW0

Bit Name Description

7–0 CW<7..0> Control Word Bit—8-bit control word.