NEC PD17134A PD17135A PD17136A PD17137A PD17P136A PD17P137A USER GUIDE

About this manual

This manual provides detailed information for engineers designing with the NEC uPD17134A subseries microcontrollers (HPD17134A, HPD17135A, HPD17136A, HPD17137A, LPD17P136A, LPD17P137A). It includes hardware descriptions, pin configurations, program counter operation, memory architecture, and peripheral functions.

The document also contains handling precautions for CMOS devices, ESD protection guidelines, and instructions for unused pins, as well as revision history, related documents, and contact information for NEC regional offices.

What's inside

• General Description
• Pin Functions
• Program Counter
• Program Memory (ROM)
• Data Memory (RAM)
• Stack
• Interrupt Functions
• Standby Function
• Reset
• Appendices

Specifications

Frequently asked questions

What precautions are recommended to prevent ESD damage to the microcontroller?

Use anti‑static containers or shielding bags, ground workbenches and tools, wear a wrist strap, avoid insulating materials that build static, and humidify dry environments.

How should unused input pins on the CMOS device be handled?

Each unused pin should be connected to VCC or GND through a resistor, treating it as a pull‑up or pull‑down to fix its level and avoid malfunction.

What is the purpose of the reset signal after power‑on?

The device is not initialized until a reset signal is received; therefore the reset operation must be executed immediately after power‑on for devices with reset function.