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8
User’s Manual U15075EJ2V1UD
INTRODUCTION
Target Readers
This manual is intended to give user engineers an understanding of the functions of
the
µ
PD789426, 789436, 789446, and 789456 Subseries to design and develop its
application systems and programs.
Target products:
•
µ
PD789426 Subseries:
µ
PD789425, 789426
•
µ
PD789436 Subseries:
µ
PD789435, 789436
•
µ
PD789446 Subseries:
µ
PD789445, 789446
•
µ
PD789456 Subseries:
µ
PD789455, 789456
Purpose
This manual is designed to deepen your understanding of the following functions
using the following organization.
Organization
Two manuals are available for the
µ
PD789426, 789436, 789446, and 789456
Subseries:
This manual and the instruction manual (common to the 78K/0S Series).
µ
PD789426, 789436, 789446,
and 789456 Subseries
User’s Manual
78K/0S
Series
User’s Manual
Instructions
•
Pin functions
•
Internal block functions
•
Interrupts
•
Other internal peripheral functions
•
Electrical specifications
•
CPU function
•
Instruction set
•
Instruction description
How to Use This Manual
It is assumed that the readers of this manual have general knowledge of electrical
engineering, logic circuits, and microcontrollers.
•
To understand the overall functions of the
µ
PD789426, 789436, 789446, and 789456
Subseries
→
Read this manual in the order of the
CONTENTS
.
•
How to read register formats
→
The name of a bit whose number is enclosed in brackets is reserved for the
assembler and is defined for the C compiler by the header file sfrbit.h.
•
To learn the detailed functions of a register whose register name is known
→
See
APPENDIX C REGISTER INDEX
.
•
To learn the details of the instruction functions of the 78K/0S series
→
Refer to
78K/0S Series Instructions User’s Manual (U11047E)
separately
available.
•
To learn the electrical specifications of the
µ
PD789426, 789436, 789446, and
789456 Subseries
→
See
CHAPTER 20 ELECTRICAL SPECIFICATIONS
.
•
The oscillation frequency of the main system clock is regarded as f
X
for
crystal/ceramic oscillation, and f
CC
for RC oscillation. The value for crystal/ceramic
oscillation (f
X
) is typically described unless otherwise specified.