User`s guide

Registers Format
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31
3.9 D/A Output Register
The D/A converter will convert the D/A output register data to the analog
signal. The register data of the address Base + 4 and Base + 5 are used for
D/A channel 1, Base +6 and Base +7 are used 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: don't care
Note: The D/A registers are "double buffered" so that the D/A analog
output signals will not updated until the second (high) byte is written.
This can insure a single step transition when the D/A conversion.