![](http://datasheet.mmic.net.cn/120000/M34501M2-XXXFP_datasheet_3558628/M34501M2-XXXFP_6.png)
4501 Group User’s Manual
i
Table of contents
DESCRIPTION ................................................................................................................................ 1-2
FEATURES ...................................................................................................................................... 1-2
APPLICATION ................................................................................................................................ 1-2
PIN CONFIGURATION .................................................................................................................. 1-3
BLOCK DIAGRAM ......................................................................................................................... 1-4
PIN DESCRIPTION ........................................................................................................................ 1-6
MULTIFUNCTION ..................................................................................................................... 1-6
PORT FUNCTION .................................................................................................................... 1-7
PORT BLOCK DIAGRAMS ..................................................................................................... 1-9
CPU .......................................................................................................................................... 1-14
PROGRAM MEMOY (ROM) .................................................................................................. 1-17
DATA MEMORY (RAM) ......................................................................................................... 1-18
INTERRUPT FUNCTION ....................................................................................................... 1-19
EXTERNAL INTERRUPTS .................................................................................................... 1-23
TIMERS ................................................................................................................................... 1-26
WATCHDOG TIMER .............................................................................................................. 1-31
A-D CONVERTER .................................................................................................................. 1-33
RESET FUNCTION ................................................................................................................ 1-38
RAM BACK-UP MODE .......................................................................................................... 1-42
CLOCK CONTROL ................................................................................................................. 1-47
ROM ORDERING METHOD ....................................................................................................... 1-49
LIST OF PRECAUTIONS ............................................................................................................ 1-50
INSTRUCTION CODE TABLE ............................................................................................ 1-102
BUILT-IN PROM VERSION ...................................................................................................... 1-104