Measurement-computing CIO-DAC16-I Manuel d'utilisateur télécharger pdf (Page 11)

4 REGISTER ARCHITECTURE

The CIO-DAC##-I is a simple board to understand. All control and data is

read/written with simple I/O read and write commands. No interrupt or DMA

control software is required. Thus, the board's outputs are easy to control directly

from BASIC, C or PASCAL.

The CIO-DAC##-I has two control and analog output registers.

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

switches on the board.

The register descriptions all follow the format:

A0A1A2A3A4A5A6A7

01234567

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 each bit.

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

Table 4-1. Register Bit Weights

801287

40646

20325

10164

883

442

221

110

HEX VALUEDECIMAL VALUEBIT POSITION

1 2 ... 6 7 8 9 10 11 12 13 14 15 16

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Measurement-computing CIO-DAC16-I Manuel d'utilisateur Page 11