I want to know how does NV read or write work? Does it use SPI or some other way?
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It is as YK stated. It should not be confused with the NVS external module, which is the SPI interface with external flash memory for OAD updates. You can also refer to the TI Drivers Runtime APIs and Z-Stack User's Guide Flash section discussing NV memory, or point to a particular code instance so that we may provide more details.