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Index Word Description
0 Header code [0x001F0080]
1 u16 unk0
2 u32 unk1


Index Word Description
0 Header code
1 Result code


This can only be used when initialized with type3. Only bitmask 0xF from unk1 is used, it's written into state then loaded later. That value is also compared with 1, depending on whether it matches different sets of data for 3 fields are loaded into state. NFC:StartTagScanning does this as well except it loads a value from state instead of from the cmdreq(where that state field is set to 0xF by NFC:Initialize with type2).

This 4-bit value seems to control what type(?) of NFC tag to scan for. The default value of 0xF is for Amiibo. Using non-value-0xF results in Amiibo tags not being found(TagState doesn't change to 3).

This is somewhat similar to NFC:StartTagScanning.