Register Description And Programming; Register Description; Control Word Register; Table 4-1. Daq-16 Address Map - Omega Engineering DAQ-16 User Manual

4. Register Description and Programming

The DAQ-16 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
Base + 2, 3
Base + 4, 5
Base + 6, 7
Base + 8
Base 9, A, B
Base + C *
Base + D *
Base E *
Base F *
4.1

Register Description

4.1.1

Control Word Register

The control word register defines and controls many of the DAQ-16's data conversion
functions. This register is 16-bit read/write.
D15
D14
D13
D12
D11
D10
D9
D8
INT2, INT1 and INT0 control the DAQ-16 interrupt source.
DAQ-16 Users Manual
Read/Write 16-bit Control Word Register
Write only 16-bit Start Conversion Register
Read only
Write only
Write only
Read/Write 8-bit Digital Input/Output Register
Reserved
Read/Write 8-bit Clock Rate Register (low)
Read/Write 8-bit Clock Rate Register (high)
Read/Write 8-bit Multi-function Timer Register
Read/Write 8-bit 8254 Control Word/Status Register

Table 4-1. DAQ-16 Address Map

Write Read
INT2 INT2
INT1 INT1
INT0 INT0
DMAEN DMAEN
DMACT DMACH
LEVEL LEVEL
TRIG TRIG
CLK CLK
INT2 INT1
0 0
1 0
1 0
1 1
1 1
16-bit A/D Data Register
16-bit D/A Channel 0 Register
16-bit D/A Channel 1 Register
Write
D7 RUN
D6 0
D5 0
D4 0
D3 0
D2 CHSL2
D1 CHSL1
D0 CHSL0
INT0 DESCRIPTION
0 Interrupt disabled
0 Interrupt timer 2
1 Interrupt on terminal count
0 External interrupt
1 Interrupt on end of conversion
Read
RUN
EOC
VALID
0
0
CHSL2
CHSL1
CHSL0
25