
User’s Manual U11919EJ4V0UD
7
INTRODUCTION
Readers
This manual is intended for user engineers who wish to understand the functions of
the
PD789026 Subseries to design and develop its application systems and
programs.
The target subseries is the
PD789026 Subseries, which consists of the
PD789022, PD789024, PD789025, PD789026, and PD78F9026A.
Purpose
This manual is designed to deepen your understanding of the functions described in
the following organization.
Organization
Two manuals are available for the
PD789026 Subseries:
this manual and
Instruction Manual (common to the 78K/0S Series).
PD789026 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 Read 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
PD789026 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 <> 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 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
PD789026 Subseries
→ Refer to CHAPTER 15 ELECTRICAL SPECIFICATIONS.
Conventions
Data significance:
Higher digits on the left and lower digits on the right
Active low representation:
××× (overscore over pin or signal name)
Note:
Footnote for item marked with Note in the text
Caution:
Information requiring particular attention
Remark:
Supplementary information
Numerical representation:
Binary ...
×××× or ××××B
Decimal ...
××××
Hexadecimal ...
××××H