User`s guide

20 • Registers
3.3 Analog Output Status Register
The DAC uses a series bus architecture hence it will take time for digital
value to be sent out. The data transfer rate for every DA data write takes
2.2µs, therefore the software driver must wait 2.2µs before sending any
other data to any analog output port. While the DA value is sending, the
Data_Send bit is ‘H’. The software driver should check this bit before
writing any data to the output port. This register is read only.
Offset Address D16~D1 D0
0x00 X Data_Send
3.4 Digital Output Register
D0~D3 is the digital output signal written to the output channels. D4~D7
are don’t cares.
Offset Address D7 D6 D5 D4 D3 D2 D1 D0
0x40 X X X X DO3 DO2 DO1 DO0
3.5 Digital Input Register
D4~D7 is digital input signal from CN1.
D0~D3 is read back signal from digital output channel.
Offset Address D7 D6 D5 D4 D3 D2 D1 D0
0x40 DI3 DI2 DI1 DI0 DO3 DO2 DO1 DO0