LC651431N
Four-Bit CMOS Microcontrollers for Small-Scale Control Applications
Overview
The /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.