UPD784938 Datasheet, PDF (8/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

How to Read This Manual Readers are required to have a general knowledge of electric engineering, logic circuits and
microcomputers.
• Unless otherwise specified
The µPD784938 is treated as the representative model. If using the µPD784935, 784936,
784937, and 78F4938, take the µPD784938 for the µPD784935, 784936, 784937, and
78F4938.
♦ To understand overall functions of the µPD784938 Subseries:
→ Read this manual in the order of the CONTENTS.
♦ To learn about differences from the µPD784908 Subseries:
→ See 1.8 Main Differences with µPD784908 Subseries.
♦ If the device operates strangely after debugging:
→ Cautions are summarized at the end of each chapter, so refer to the cautions for the
relevant function.
♦ To learn the detailed functions of a register whose register name is known:
→ Use APPENDIX C REGISTER INDEX.
♦ To learn the details of the instruction functions:
→ Refer to 78K/IV Series User’s Manual-Instruction (U10905E) separately available.
♦ To learn about the electrical characteristics:
→ Refer to Data Sheets.
♦ To learn about application examples of each function:
→ Refer to Application Note separately available.
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 ......................... × × × × B or × × × ×
Decimal ...................... × × × ×
Hexadecimal ............... × × × × H
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Preliminary User’s Manual U13987EJ1V0UM00