Measurement-computing CIO-DAS16/M1 Manual de usuario descargar pdf (Pagina 17)

Table 4-2. Bit Weights

BIT POSITION DECIMAL VALUE HEX VALUE

01 1

12 2

24 4

38 8

416 10

532 20

664 40

7 128 8

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

byte. Data read from registers must be analyzed to determine which bits are on or off.

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

covered in most

Introduction To Programming

books, available from a book store.

Board registers and their functions are listed in Table 4-3. Each register has eight bits which can

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

Table 4-3. Register Summary

ADDRESS READ FUNCTION-ALL MODES WRITE FUNCTION

BASE + 0 A/D Data Read as Word Start A/D Conversion

BASE + 1 Do not use None

BASE + 2 Control & Status Bits Control Bits

BASE + 3 Digital 4 Bits Input Digital 4 Bit Output

BASE + 4 None Clear Interrupt Status

BASE + 5 Interrupt Control-Pacer Source Set Interrupt & Pacer Source

BASE + 6 Channel Gain Queue Address Set Channel Gain Queue Address

BASE + 7 Channel Gain Queue Data Write Channel Gain Queue Data

BASE + 8 Total Counter Upper Half Total Counter Upper

BASE + 9 Total Counter Lower Half Total Counter Lower

BASE + A Pre-trigger Index Pre-trigger Index Start Value

BASE + B None-No read-back on 82C54 Total & Pre-trigger Counter Ctrl

BASE + C Counter 0 Data Counter 0 Data

BASE + D CTR 1 Data - A/D Pacer Clock CTR 1 Data - A/D Pacer Upper

BASE + E CTR 2 Data - A/D Pacer Clock CTR 2 Data - A/D Pacer Lower

BASE + F None-No read-back on 82C54 Pacer Clock Control

82C54 and 82C55 – 2

Connector

BASE+400 82C55 Port A Data 82C55 Port A Data

BASE+401 82C55 Port B Data 82C55 Port B Data

BASE+402 82C55 Port C Data 82C55 Port C Data

BASE+403 None-No read-back on 82C55 82C55 Control Register

BASE+404 82C54 User Counter 0 Data 82C54 User Counter 0 Load

BASE+405 82C54 User Counter 1 Data 82C54 User Counter 1 Load

BASE+406 82C54 User Counter 2 Data 82C54 User Counter 2 Load

BASE+407 None-No read-back on 82C54 82C54 User Counter Control

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 37 38

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