MFR_STORE_SINGLE (FCh) is the command that instructs MAX34461 to transfer a single configuration parameter to internal flash memory.
The upper byte contains the PAGE and the lower byte contains the PMBus command that should be stored.
Example:
If the TON_DELAY parameter for the power supply controlled by PAGE4 needs to be stored to flash, then send command FCh followed by 0460h.
04 decodes PAGE4 and 60h decodes TON_DELAY.