HC705L5

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HC705L5 Technical Summary

Overview

The HC705L5 is an 80-pin microcontroller unit (MCU) with advanced on-chip peripheral functions. It features 8KB of user ROM, 256 bytes of static RAM, and sophisticated I/O capabilities. The device is designed for low-power applications with multiple operating modes and includes specialized features like LCD drivers and serial communication interfaces.

Key Features

• 8-bit M68HC05 architecture
• 8KB user ROM with 256 bytes RAM
• Five parallel I/O ports (Ports A-E)
• Integrated LCD driver with multiple bias options
• Simple Serial Peripheral Interface (SSPI)
• 8-bit and 16-bit timer systems
• Computer Operating Properly (COP) watchdog timer
• Multiple low-power modes (Stop, Wait)
• Key wakeup interrupt capability
• Dual oscillator system for clock flexibility

Applications

• Consumer electronics
• Industrial control systems
• Automotive electronics
• Medical devices
• LCD-based display systems
• Battery-powered devices

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.3V to +7.0V
• Input Voltage: -0.3V to VDD+0.3V
• Operating Temperature: -40°C to +85°C
• Storage Temperature: -55°C to +150°C

Recommended Operating Conditions

• Supply Voltage (VDD): 3.0V to 5.5V
• Operating Temperature: -40°C to +85°C
• Input High Voltage: 0.7 × VDD
• Input Low Voltage: 0.2 × VDD

Power Consumption

• Active Mode (5V @ 4MHz): 10mA typical
• Wait Mode (5V): 2mA typical
• Stop Mode (5V): 100μA typical

Package Information

The HC705L5 is available in an 80-pin Quad Flat Pack (QFP) package with the following mechanical specifications:

• Package Type: QFP-80
• Body Size: 14mm × 14mm
• Lead Pitch: 0.65mm
• Lead Count: 80
• Package Weight: 0.5g typical

Detailed Functional Description

Memory Organization

The memory map includes:

• 0000-00FF: RAM (256 bytes)
• 0100-01FF: I/O and control registers
• 0200-1FFF: User ROM (8KB)
• Special self-check ROM area

I/O Ports

The device features five 8-bit I/O ports with various alternate functions:

• Port A: General purpose I/O
• Port B: General purpose I/O with key wakeup interrupt capability
• Port C: Special function I/O (SPI, timer, interrupts)
• Port D: LCD backplane drivers and general I/O
• Port E: LCD frontplane drivers and general I/O

Timer System

The timer subsystem includes:

• 8-bit Timer 1 with input capture/output compare
• 16-bit Timer 2 with enhanced features
• Programmable prescaler
• Event input/output capabilities

LCD Driver

The integrated LCD controller supports:

• Up to 4 backplane configurations
• 1/2, 1/3 bias options
• Multiple duty cycles (1/1, 1/2, 1/3, 1/4)
• Integrated voltage generation

Development Support

The HC705L5 is supported by:

• In-circuit emulation tools
• Cross-compilers and assemblers
• Evaluation boards
• Programming tools for ROM verification

Ordering Information

The device is available in multiple variants with different temperature ranges and package options. Consult the manufacturer's latest datasheet for current part numbers and availability.

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