21.6 Usage Notes ....................................................................................................................... 815
22.1 Register Descriptions ......................................................................................................... 823
22.3 Notes on Usage .................................................................................................................. 842
Section 23 I/O Ports ...........................................................................................843
23.1 Port A................................................................................................................................. 843
23.2 Port B ................................................................................................................................. 845
23.3 Port C ................................................................................................................................. 847
23.4 Port D................................................................................................................................. 849
Rev. 4.00 Sep. 14, 2005 Page xxv of l