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Hi Yifu,
The DAC output changes value when a new code is written to the output register using DB15-DB0. The data is loaded to the register on the rising edge of the CS control signal, so you'll at least need to control CS for a new value to be written:
The logic truth table defines what needs to be done with the control signals. You can leave R/W, RST, RSTSEL, and LDAC at static values in the highlighted case:
Best,
Katlynne Jones
