no documentsBut i know the access process:(above all,we name base 64K and extended 64K for convenience )
1 when you address base 64K ,do it as usually.
2 when you aaddress extended 64K ,you should firstly assert the cs pin(e.g.P1.0),then you can use extended 64K as if base 64K.Acctually,it is extended 64K ,which is already mapped to such.