Omega Engineering DAQ-12 user manual Register Description, Control Word Register

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).

Base + 0, 1	Read/Write 16-bit Control Word Register
Base + 2, 3	Write only	16-bit Start Conversion Register
	Read only	16-bit A/D Data Register
Base + 4, 5	Write only	16-bit D/A Channel 0 Register
Base + 6, 7	Write only	16-bit D/A Channel 1 Register
Base + 8	Read/Write	8-bit	Digital Input/Output Register
Base 9	Read/Write	8-bit	Gain Control Register
Base A, B	Reserved
Base + C *	Read/Write	8-bit	Clock Rate Register (low)
Base + D *	Read/Write	8-bit	Clock Rate Register (high)
Base E *	Read/Write	8-bit	Multi-function Timer Register
Base F *	Read/Write	8-bit	8254 Control Word/Status Register

Table 4-1. DAQ-12 Address Map

4.1Register Description

4.1.1Control 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

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