ADLINK ACL-8112 Series - Manual (Page 46)

38 • Registers
4.9 D/A Output Register
The D/A converter will convert the D/A output register data to an analog
signal. The register data at address Base + 4 and Base + 5 are used for D/A
channel 1 and Base +6 and Base +7 for D/A channel 2.
Address : BASE + 4 & BASE + 5
Attribute: write only
Data Format: (for D/A Channel 1)
Bit 7 6 5 4 3 2 1 0
Base + 4 DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0
Base + 5 X X X X DA11 DA10 DA9 DA8
Address : BASE + 6 & BASE + 7
Attribute: write only
Data Format: (for D/A Channel 2)
Bit 7 6 5 4 3 2 1 0
Base + 6 DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0
Base + 7 X X X X DA11 DA10 DA9 DA8
DA0 is the LSB and DA11 is the MSB of the 12 bits data.
X: does not matter
Note: The D/A registers are "double buffered" so that the D/A analog output
signals will not updated until the second (high) byte contains data or
written to. This will ensure a single step transition for a D/A conversion.