Maximum memory on SQL Server 2012 Standard

Dear everyone,

   I would like to check with all of you about maximum memory on SQL Server 2012 Standard.

   If refer from http://msdn.microsoft.com/en-us/library/cc645993.aspx that said SQL Server 2012 Standard supported Maximum Memory utilized 64 GBper instance of SQL Server Database Engine.

   My question, currently I have 1 Server memory 128 GB

   I can allocate memory 64GB to 1st instance and other 64GB to 2nd instance or not?

   Please advise. Thank you very much.