Omega-engineering DAQ-12 Manual do Utilizador descarregar pdf (Página 25)

4. Register Description and Programming

The DAQ-12 uses 16 consecutive I/O address locations in the range 0 to FFFFH. The card

utilizes these addresses for the registers listed in Table 4-1. (* indicates registers located in

8254 counter).

Read/Write 8-bit 8254 Control Word/Status Register

Base F *

Read/Write 8-bit Multi-function Timer Register

Base E *

Read/Write 8-bit Clock Rate Register (high)

Base + D *

Read/Write 8-bit Clock Rate Register (low)

Base + C *

Reserved

Base A, B

Read/Write 8-bit Gain Control Register

Base 9

Read/Write 8-bit Digital Input/Output Register

Base + 8

Write only 16-bit D/A Channel 1 Register

Base + 6, 7

Write only 16-bit D/A Channel 0 Register

Base + 4, 5

Write only 16-bit Start Conversion Register

Read only 16-bit A/D Data Register

Base + 2, 3

Read/Write 16-bit Control Word Register

Base + 0, 1

Table 4-1. DAQ-12 Address Map

4.1 Register Description

4.1.1 Control Word Register

The control word register defines and controls many of the DAQ-12'S data conversion

functions. This register is 16-bit read/write.

Write Read Write Read

D15 INT2 INT2 D7 RUN RUN

D14 INT1 INT1 D6 0 EOC

D13 INT0 INT0 D5 0 VALID

D12 DMAEN DMAEN D4 DMASL DMASL

D11 DMACT DMACH D3 CHSL3 CHSL3

D10 LEVEL LEVEL D2 CHSL2 CHSL2

D9 TRIG TRIG D1 CHSL1 CHSL1

D8 CLK CLK D0 CHSL0 CHSL0

DAQ-12 Users Manual 25

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 31

Sem comentários

Omega-engineering DAQ-12 Manual do Utilizador Página 25