NEC 78K0S/K B1+ 8-bit Microcontroller User Manual

About this manual

This manual provides detailed information for engineers who need to understand and design with the NEC 78K0S/K B1+ 8‑bit microcontroller series (µPD78F9232, µPD78F9234). It covers pin functions, internal modules, interrupt handling, electrical characteristics, CPU registers, instruction set, clock generator, and timer/event counter operation.

The document also includes safety notes, recommended power‑up/down sequences, handling of unused CMOS pins, and flash programming procedures. References to related NEC datasheets, programming manuals, and development tools are listed for further detail. This manual is written in Chinese.

What's inside

• Overview and Features
• Pin Configuration
• CPU Structure
• Port Function
• Clock Generator
• 16‑bit Timer / Event Counter
• Flash Memory Programming
• Power‑up / Power‑down Sequence
• Unused CMOS Pin Handling

Frequently asked questions

What is the recommended power‑up sequence for the 78K0S/K B1+?

First turn on the internal power supply, then the external supply; for power‑down, turn off the external supply before the internal one.