4501_M Datasheet, PDF (6/212 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 4500 SERIES

4501 Group
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
Rev.2.01 Feb 07, 2005
ii
REJ09B0192-0201