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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 operation(Standby 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 V(L 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 circuit(N and L versions)

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