Measurement-computing CIO-DAS16 Instrukcja Użytkownika Pobierz pdf (Strona 22)

4 CIO-DAS16 CONTROL & DATA REGISTERS

4.1 INTRODUCTION

The CIO-DAS16 is controlled and monitored by writing to and reading from 20 consecutive 8-bit I/O addresses

(registers). The first address, or BASE ADDRESS, is determined by setting a bank of switches on the board.

implemented in easy-to-use Universal Library™ routines.

The register descriptions all follow the format:

CH1CH2CH4CH8A/D12

LSB

A/D11A/D10A/D9

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 that bit.

To write to or read from a register in decimal or HEX, the following weights apply (Table 4-1):

Table 4-1. Register Bit Weights

801287

40646

20325

10164

883

442

221

110

HEX VALUEDECIMAL VALUEBIT POSITION

To write control 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.

In summary form, the registers and their function are listed on Table 4-2. Within each register are eight bits which may

constitute a byte of data or eight individual bit read/write functions.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 35 36

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