4501 datasheet(6/212 Pages) RENESAS

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4501 Group

REJ09B0192-0201

Rev.2.01

Feb 07, 2005

Table of contents

CHAPTER 2 APPLICATION

2.1 I/O pins .................................................................................................................................... 2-2

2.1.1 I/O ports .......................................................................................................................... 2-2

2.1.2 Related registers ............................................................................................................ 2-5

2.1.3 Port application examples ............................................................................................. 2-9

2.1.4 Notes on use ................................................................................................................ 2-10

2.2 Interrupts ............................................................................................................................... 2-12

2.2.1 Interrupt functions ........................................................................................................ 2-12

2.2.2 Related registers .......................................................................................................... 2-13

2.2.3 Interrupt application examples .................................................................................... 2-16

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

2.3.3 Timer application examples ........................................................................................ 2-24

2.3.4 Notes on use ................................................................................................................ 2-31

2.4 A/D converter ....................................................................................................................... 2-33

2.4.1 Related registers .......................................................................................................... 2-34

2.4.2 A/D converter application examples .......................................................................... 2-34

2.4.3 Notes on use ................................................................................................................ 2-36

2.5 Reset ....................................................................................................................................... 2-38

2.5.1 Reset circuit .................................................................................................................. 2-38

2.5.2 Internal state at reset .................................................................................................. 2-39

2.5.3 Notes on use ................................................................................................................ 2-40

2.6 Voltage drop detection circuit .......................................................................................... 2-41

2.7 RAM back-up ........................................................................................................................ 2-42

2.7.1 RAM back-up mode ..................................................................................................... 2-42

2.7.2 Related registers .......................................................................................................... 2-44

2.7.3 Notes on use ................................................................................................................ 2-48

2.8 Oscillation circuit ................................................................................................................ 2-49

2.8.1 Oscillation circuit .......................................................................................................... 2-49

2.8.2 Oscillation operation .................................................................................................... 2-51

2.8.3 Notes on use ................................................................................................................ 2-52

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