LC651431F

Four-Bit CMOS Microcontrollers for Small-Scale Control Applications

Overview

The LC651431N/F/L and LC651432N/F/L are the small scale control models in Sanyo’s LC6500 Series of 4-bit

microcontrollers and feature the same basic architecture and instruction set.

Features

• Fabricated in a CMOS process for low power operationStandby mode can be controlled by CPU instructions.

• ROM/RAM

  LC651432N/F/L

—ROM: 2 K ×8 bits, RAM: 128 ×4 bits

  LC651431N/F/L

—ROM: 1 K ×8 bits, RAM: 64 ×4 bits

• Instruction set: The 80-instruction set common to the whole LC6500 Series

• Wide operating supply voltage range of 2.2 to 6.0 VL versions

• Instruction cycle time of 0.92 µs F versions

• On-chip serial I/O function

• Highly flexible I/O ports

  Number of ports

— 7 ports Up to 25 pins

All ports

— Can be used for either input or output

— Voltage handling capability input and output: 15 V maximum For open-drain specification ports

— Output current: 20 mA maximum sink current Capable of directly driving an LED. I/O port options to match application requirements:

— Open-drain output and pull-up resistor specification: Can be specified for all ports in bit units.

— Output level at reset specification: Either a high or low level can be specified for ports C and D in 4-bit units each.

• Interrupts

  Timer overflow vector interrupt can also be tested by CPU instructions

  INT pin or serial I/O full/empty vector interrupt can also be tested by CPU instructions

• Stack levels: 4 levels also used by interrupts

• Timers: 8-bit programmable timer with 4-bit prescaler

• Clock oscillator options to match application requirements:

Oscillator circuit option:

— Two-pin RC oscillator N and L versions Two-pin ceramic oscillator or single external clock input pin N, F, and L versions

— Divider circuit option: No divider, built-in divide by-three circuit, built-in divide-by-four circuitN and L versions

• Continuous square-wave output with a period 64 times the cycle time.