Measurement-computing CIO-DAC02/16 Instrukcja Użytkownika Pobierz pdf (Strona 10)

5 DATA REGISTERS

The CIO-DAC02/16 has four analog-output data registers. There are two for each

channel, one for the lower eight bits and one for the upper eight bits. The first address

(BASE ADDRESS) is determined by setting a bank of DIP switches on the board.

The information presented in this chapter is intended for experienced programmers. If

you are not familiar with register manipulation, we encourage you to use the Universal

Library.

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

The registers and their function are listed on Table 5-1.

Table 5-1. Data Registers

Initiate simultaneous update.D/A 1 Most Significant ByteBASE + 3

Initiate simultaneous update.D/A 1 Least Significant ByteBASE + 2

Initiate simultaneous update.D/A 0 Most Significant ByteBASE + 1

Initiate simultaneous update.D/A 0 Least Significant ByteBASE + 0

READ FUNCTIONWRITE FUNCTIONADDRESS

The bits of the registers are labeled as follows:

BASE + 0 and BASE +2 (LEAST SIGNIFICANT BYTE)

DA16

(LSB)

DA15DA14DA13DA12DA11DA10DA9

01234567

BASE + 1 and BASE +3 (MOST SIGNIFICANT BYTE)

DA8DA7DA6DA5DA4DA3DA2DA1

(MSB)

01234567

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

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Measurement-computing CIO-DAC02/16 Instrukcja Użytkownika Strona 10