How to Read This Manual : It is assumed that the reader of this manual has general knowledge in the fields of
electrical engineering, logic circuits, and microcontrollers.
• To check the details of an instruction function when the mnemonic is known:
→ Use APPENDIX A and APPENDIX B INDEX OF INSTRUCTIONS.
• To check an instruction when you know the general function but do not know the
mnemonic:
→ Find the mnemonic in CHAPTER 6 INSTRUCTION SET, then check the function
in CHAPTER 7 DESCRIPTION OF INSTRUCTIONS.
• For a general understanding of the various instruction functions of the 78K/IV Series:
→ Read in accordance with the contents.
• For information on the hardware functions of the 78K/IV Series:
→ Read the separate User’s Manual.
– µPD784026 Subseries User’s Manual – Hardware (U10898E)
– µPD784038, 784038Y Subseries User’s Manual – Hardware (U11316E)
– µPD784046 Subseries User’s Manual – Hardware (U11515E)
– µPD784054 User’s Manual – Hardware (U11719E)
– µPD784216A, 784216AY, 784218A, 784218AY Subseries User’s Manual –
Hardware (U12015E)
– µPD784225, 784225Y Subseries User’s Manual – Hardware (U12679E)
– µPD784908 Subseries User’s Manual – Hardware (U11787E)
– µPD784915 Subseries User’s Manual – Hardware (U10444E)
– µPD784928, 784928Y Subseries User’s Manual – Hardware (U12648E)
– µPD784938A Subseries User’s Manual – Hardware (To be prepared)
– µPD784956A Subseries User’s Manual – Hardware (U14395E)
– µPD784976A Subseries User’s Manual – Hardware (U15017E)
Conventions
: Data significance
Active low representation
Note
Caution
Remark
Numerical notations
: Higher digit on left and lower digit on right
: ××× (overscore over pin or signal name)
: Footnote for item marked with Note in the text
: Information requiring particular attention
: Supplementary information
: Binary
××××B or ××××
Decimal
××××
Hexadecimal
××××H
8
User’s Manual U10905EJ8V1UM