NEC PD754144, PD754244 INTRODUCTION

7
User’s Manual U10676EJ3V0UM
INTRODUCTION
Readers This manual is intended for user engineers who wish to understand the functions of
the µ PD754144 and 754244 and design application systems using these microcontrollers.
Purpose This manual is intended to give users an understanding of the hardware functions of
the
µ PD754144 and 754244 described in the Organization below.
Organization This manual contains the following information.
• General
• Pin Functions
• Features of Architecture and Memory Map
• Internal CPU Functions
• EEPROM
• Peripheral Hardware Functions
• Interrupt Functions and Test Functions
• Standby Functions
• Reset Functions
• Mask option
• Instruction Set
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 users who use this manual as a manual for
µ PD754144 (RC oscillation, fCC)
→Unless otherwise specified, the
µ PD754244 (crystal/ceramic oscillation, fX) is
treated as the representative model in this manual. Check the functional
differences between the µ PD754144 and µ PD754244 by referring to 1.3
Differences Between
µ PD754144 and 754244, and take the µ PD754244 as
µ PD754144 and fX as fCC.
•To check the functions of an instruction whose mnemonic is known,
→Refer to APPENDIX C INSTRUCTION INDEX.
•To check the functions of a specific internal circuit,
→Refer to APPENDIX D HARDWARE INDEX.
•To understand the overall functions of the
µ PD754144 and 754244,
→Read this manual in the order of the CONTENTS.
Conventions Data significance: Higher digits on the left and lower digits on the right
Active low representations: ××× (overscore over pin and signal name)
Note: Footnote for item marked with Note in the text.
Caution: Information requiring particular attention
Remark: Supplementary information
Numerical representations: Binary ... ×××× or ××××B
Decimal ... ××××
Hexadecimal ... ××××H