To save any values surviving a power-down the only solution is to use EEProm.
You need power to program the EEProm
Sounds like a logical paradoxon?
Well you'll have to detect the power-down situation early (lost of AC) and use a gold-cap that lasts for programming the eeprom and shut-down.
The SaveConfiguration() of the DAC is only used to store some info for sleep-mode in SRam which will be lost at PD.
Power to the PSoC!
Thanks for the information.
Since this value isn't meant to change continuously during operation, it may be safe just to write it whenever the value is changed.