Measurement-computing PC104-AC5 Manual do Utilizador descarregar pdf (Página 10)

3 REGISTER ARCHITECTURE

3.1 INTRODUCTION

The PC104-AC5 contains three data and one control register for the 24 lines of digital

I/O.

The first address, or BASE ADDRESS, is determined by setting a bank of switches on

the board.

PC104-AC5 functions are implemented in the easy to use Universal Library.

The register descriptions follow all follow the format:

A0A1A2A3A4A5A6A7

01234567

Where the numbers along the top row are the bit positions within the 8-bit byte and

the numbers and symbols in the bottom row are the functions associated with that bit.

To write to or read from a register in decimal or HEX, the following weights apply:

801287

40646

20325

10164

883

442

221

110

HEX VALUEDECIMAL VALUEBIT POSITION

To write a control word or data to a register, the individual bits must be set to 0 or 1

then combined to form a byte.

The method of programming required to set/read bits from bytes is beyond the scope

of this manual.

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Measurement-computing PC104-AC5 Manual do Utilizador Página 10