Added some comments
Added some comments


Former-commit-id: 068ce09daffab82de52a23f58c86a13bd5584317

EmbeddedMan/chipKIT-core,EmbeddedMan/chipKIT-core,UECIDE/chipKIT-core,pontech/chipKIT-core,chipKIT32/chipkit-core,pontech/chipKIT-core,pontech/chipKIT-core,chipKIT32/chipkit-core,ricklon/chipKIT-core,EmbeddedMan/chipKIT-core,ricklon/chipKIT-core,majenkotech/chipKIT-core,chipKIT32/chipkit-core,adamwolf/chipKIT-core,majenkotech/chipKIT-core,adamwolf/chipKIT-core,UECIDE/chipKIT-core,majenkotech/chipKIT-core,ricklon/chipKIT-core,EmbeddedMan/chipKIT-core,ricklon/chipKIT-core,pontech/chipKIT-core,majenkotech/chipKIT-core,pontech/chipKIT-core,UECIDE/chipKIT-core,majenkotech/chipKIT-core,pontech/chipKIT-core,ricklon/chipKIT-core,adamwolf/chipKIT-core,UECIDE/chipKIT-core,adamwolf/chipKIT-core,pontech/chipKIT-core,adamwolf/chipKIT-core,chipKIT32/chipkit-core,adamwolf/chipKIT-core,adamwolf/chipKIT-core,chipKIT32/chipkit-core,majenkotech/chipKIT-core,ricklon/chipKIT-core,EmbeddedMan/chipKIT-core,EmbeddedMan/chipKIT-core,UECIDE/chipKIT-core,EmbeddedMan/chipKIT-core,majenkotech/chipKIT-core