
4551 Group User’s Manual
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Table of contents
DESCRIPTION ................................................................................................................................ 1-3
 FEATURES ...................................................................................................................................... 1-3
 APPLICATION ................................................................................................................................ 1-3
 PORT FUNCTION .................................................................................................................. 1-7
 PORT BLOCK DIAGRAMS .................................................................................................. 1-8
 PROGRAM MEMORY (ROM) ............................................................................................. 1-13
 DATA MEMORY (RAM) ...................................................................................................... 1-14
 INTERRUPT FUNCTION ..................................................................................................... 1-15
 EXTERNAL INTERRUPTS .................................................................................................. 1-18
 TIMERS ................................................................................................................................. 1-20
 WATCHDOG TIMER ............................................................................................................ 1-24
 RESET FUNCTION .............................................................................................................. 1-32
 POWER DOWN FUNCTION ............................................................................................... 1-35
 CLOCK CONTROL .............................................................................................................. 1-38
 ROM ORDERING METHOD ....................................................................................................... 1-39
 LIST OF PRECAUTIONS ............................................................................................................ 1-40
 SYMBOL ........................................................................................................................................ 1-41
 MACHINE INSTRUCTIONS ........................................................................................................ 1-46
 BUILT-IN PROM VERSION ........................................................................................................ 1-64
 Table of contents