CHAPTER
This chapter describes the functions and operation of
the I/O ports.
4.1
4.2
Ports 0 and 1 ................................................................ 90
4.3
Port 2 ............................................................................ 94
4.4
Port 3 ............................................................................ 98
4.5
Port 4 .......................................................................... 104
4.6
Port 5 .......................................................................... 108
4.7
Port 6 .......................................................................... 112
4.8
I/O PORTS
4