This document is the user's manual for μPD78F9500, 78F9501, 78F9502 8-Bit Single-Chip Microcontrollers
This manual provides engineers with detailed information on the NEC PD78F9500, 78F9501 and 78F9502 8‑bit single‑chip microcontrollers. It includes an overview of features, ordering information, pin configuration, block diagrams and functional outlines, as well as guidance on how to read register formats and use the related development tools.
The document also contains chapters on pin functions, CPU architecture, instruction sets, electrical specifications, and a list of cautions for proper handling, power sequencing, and ESD protection. Appendices provide additional reference tables and contact information for NEC support.
Unused CMOS input pins should be tied to VCC or GND through a resistor to prevent floating levels that could cause malfunction.
No. Applying signals or a pull‑up supply while the device is unpowered can cause current injection and damage.