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WL1835MOD: WL1835MODGB COM8 Card use "BT_FUNC1" connect to IC Pin#21 as a OUTPUT signal ?

Part Number: WL1835MOD

WL1835MODGB COM8 Card pin74 connected  to WL1835MOD IC  Pin #21 which  is a output pin to wake up host from BT signal,

but in WL1835MOD data sheet listed PIN 21 RESERVED1 = Input  pin  ?