
ii
4506 Group User’s Manual
2.1 I/O pins .................................................................................................................................... 2-2
 2.1.1 I/O ports .......................................................................................................................... 2-2
 2.1.2 Related registers ............................................................................................................ 2-5
 2.2.1 Interrupt functions ........................................................................................................ 2-12
 2.2.2 Related registers .......................................................................................................... 2-13
 2.2.4 Notes on use ................................................................................................................ 2-20
 2.3 Timers .................................................................................................................................... 2-21
 2.3.1 Timer functions ............................................................................................................. 2-21
 2.3.2 Related registers .......................................................................................................... 2-22
 2.3.4 Notes on use ................................................................................................................ 2-32
 2.4 A-D converter ....................................................................................................................... 2-33
 2.4.1 Related registers .......................................................................................................... 2-34
 2.4.3 Notes on use ................................................................................................................ 2-36
 2.5.1 Reset circuit .................................................................................................................. 2-38
 2.5.3 Notes on use ................................................................................................................ 2-39
 2.6 RAM back-up ........................................................................................................................ 2-40
 2.6.1 RAM back-up mode ..................................................................................................... 2-40
 2.6.2 Related registers .......................................................................................................... 2-42
 2.6.3 Notes on use ................................................................................................................ 2-46
 2.7 Oscillation circuit ................................................................................................................ 2-47
 2.7.3 Notes on use ................................................................................................................ 2-50
 Table of contents