ADVANCED AND EVER ADVANCING
MITSUBISHI ELECTRIC
MITSUBISHI 4-BIT SINGLE-CHIP MICROCOMPUTER
4500 SERIES
4551
Group
User’s Manual
MITSUBISHI
ELECTRIC
keep safety first in your circuit designs !
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Mitsubishi Electric Corporation puts the maximum effort into making semiconductor
products better and more reliable, but there is always the possibility that trouble
may occur with them. Trouble with semiconductors may lead to personal injury,
fire or property damage. Remember to give due consideration to safety when
making your circuit designs, with appropriate measures such as (i) placement
of substitutive, auxiliary circuits, (ii) use of non-flammable material or (iii) prevention
against any malfunction or mishap.
Notes regarding these materials
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These materials are intended as a reference to assist our customers in the
selection of the Mitsubishi semiconductor product best suited to the customer’s
application; they do not convey any license under any intellectual property rights,
or any other rights, belonging to Mitsubishi Electric Corporation or a third party.
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infringement of any third-party’s rights, originating in the use of any product
data, diagrams, charts or circuit application examples contained in these materials.
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and charts, represent information on products at the time of publication of these
materials, and are subject to change by Mitsubishi Electric Corporation without
notice due to product improvements or other reasons. It is therefore recommended
that customers contact Mitsubishi Electric Corporation or an authorized Mitsubishi
Semiconductor product distributor for the latest product information before
purchasing a product listed herein.
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Mitsubishi Electric Corporation semiconductors are not designed or manufactured
for use in a device or system that is used under circumstances in which human
life is potentially at stake. Please contact Mitsubishi Electric Corporation or an
authorized Mitsubishi Semiconductor product distributor when considering the
use of a product contained herein for any specific purposes, such as apparatus
or systems for transportation, vehicular, medical, aerospace, nuclear, or undersea
repeater use.
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Any diversion or reexport contrary to the export control laws and regulations of
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Please contact Mitsubishi Electric Corporation or an authorized Mitsubishi
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Preface
This user’s manual describes the hardware and
instructions of Mitsubishi’s 4551 Group CMOS 4-bit
microcomputer.
After reading this manual, the user should have a
through knowledge of the functions and features of
the 4551 Group and should be able to fully utilize
the product. The manual starts with specifications
and ends with application examples.
BEFORE USING THIS USER’S MANUAL
This user’s manual consists of the following three chapters. Refer to the chapter appropriate to your conditions,
such as hardware design or software development.
1. Organization
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CHAPTER 1 HARDWARE
This chapter describes features of the microcomputer and operation of each peripheral function.
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CHAPTER 2 APPLICATION
This chapter describes usage and application examples of peripheral functions, based mainly on setting
examples of related registers.
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CHAPTER 3 APPENDIX
This chapter includes precautions for systems development using the microcomputer, the mask ROM
confirmation forms (mask ROM version), ROM programming confirmation forms (One Time PROM version)
and mark specification forms which are to be submitted when ordering.
Be sure to refer to this chapter because this chapter also includes necessary information for systems
development.
Table of contents
Table of contents
CHAPTER 1 HARDWARE
DESCRIPTION ................................................................................................................................ 1-3
FEATURES ...................................................................................................................................... 1-3
PIN CONFIGURATION (TOP VIEW) ........................................................................................... 1-3
APPLICATION ................................................................................................................................ 1-3
BLOCK DIAGRAM ......................................................................................................................... 1-4
PERFORMANCE OVERVIEW ....................................................................................................... 1-5
DEFINITION OF CLOCK AND CYCLE ....................................................................................... 1-5
PIN DESCRIPTION ........................................................................................................................ 1-6
MULTIFUNCTION ................................................................................................................... 1-7
CONNECTIONS OF UNUSED PINS ................................................................................... 1-7
PORT FUNCTION .................................................................................................................. 1-7
PORT BLOCK DIAGRAMS .................................................................................................. 1-8
FUNCTIONAL BLOCK OPERATIONS ...................................................................................... 1-10
CPU ........................................................................................................................................ 1-10
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
CARRIER GENERATING CIRCUIT ................................................................................... 1-25
LCD FUNCTION ................................................................................................................... 1-28
RESET FUNCTION .............................................................................................................. 1-32
VOLTAGE DROP DETECTION CIRCUIT ......................................................................... 1-34
POWER DOWN FUNCTION ............................................................................................... 1-35
CLOCK CONTROL .............................................................................................................. 1-38
ROM ORDERING METHOD ....................................................................................................... 1-39
LIST OF PRECAUTIONS ............................................................................................................ 1-40
SYMBOL ........................................................................................................................................ 1-41
LIST OF INSTRUCTION FUNCTION ........................................................................................ 1-42
INSTRUCTION CODE TABLE .................................................................................................... 1-44
MACHINE INSTRUCTIONS ........................................................................................................ 1-46
CONTROL REGISTERS .............................................................................................................. 1-60
BUILT-IN PROM VERSION ........................................................................................................ 1-64
PIN CONFIGURATION (TOP VIEW) ......................................................................................... 1-64
4551 Group User’s Manual
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