HC05B

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HC05B Microcontroller Technical Summary

Overview

The HC05B is an 8-bit microcontroller unit (MCU) from Motorola's MC68HC05 family, designed for cost-sensitive embedded applications. This fully static CMOS device integrates multiple peripherals with a high-performance CPU core, offering a balance of processing power and energy efficiency. Key features include on-chip memory subsystems, analog interfaces, and flexible I/O capabilities that make it suitable for a wide range of industrial and consumer applications.

Key Features

• CPU Core: 8-bit HC05 architecture with fully static design (operates down to DC)
• Clock System: On-chip oscillator supporting crystal, resonator or external clock input
• Memory:
  • Up to 32KB ROM (varies by model)
  • 176-1024 bytes RAM
  • 128-512 bytes EEPROM with byte-level erase/program capability
• Analog Peripherals:
  • 8-channel 8-bit ADC
  • 2 pulse-width modulation (PWM) outputs
• Digital I/O: Up to 56 programmable I/O pins with interrupt capability
• Timers: 16-bit programmable timer with input capture/output compare
• Communication: Serial Communications Interface (SCI) with baud rate generator
• Power Management: Multiple low-power modes (STOP, WAIT, SLOW)
• Packages: Available in PLCC (52-pin), QFP (64-pin), and SDIP (56-pin)

Applications

The HC05B family is designed for embedded control applications including:

• Industrial control systems
• Automotive electronics
• Consumer appliances
• Sensor interfaces
• Power management systems
• Human-machine interfaces
• Motor control applications

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

DC Characteristics (5V Operation)

• Supply Voltage: 4.5V to 5.5V
• Input High Voltage: 0.7VDD min
• Input Low Voltage: 0.2VDD max
• Output High Voltage: VDD-0.8V min @ 2mA
• Output Low Voltage: 0.4V max @ 2mA
• Power Consumption:
  • Run Mode: 10mA @ 4MHz
  • Wait Mode: 2mA @ 4MHz
  • Stop Mode: 50μA typical

ADC Characteristics

• Resolution: 8 bits
• Conversion Time: 32μs @ 1MHz ADC clock
• Integral Nonlinearity: ±1 LSB
• Differential Nonlinearity: ±0.5 LSB
• Analog Input Range: VRL to VRH

Package Information

52-pin PLCC

• Package Dimensions: 19.1mm x 19.1mm body
• Lead Pitch: 1.27mm
• Lead Count: 52 (13 per side)
• Thermal Characteristics:
  • θJA: 50°C/W
  • θJC: 15°C/W

64-pin QFP

• Package Dimensions: 14mm x 14mm body
• Lead Pitch: 0.8mm
• Lead Count: 64 (16 per side)
• Thermal Characteristics:
  • θJA: 45°C/W
  • θJC: 12°C/W

56-pin SDIP

• Package Dimensions: 22.86mm x 10.16mm body
• Lead Pitch: 2.54mm
• Lead Count: 56 (28 per side)
• Thermal Characteristics:
  • θJA: 35°C/W
  • θJC: 10°C/W

Functional Description

Memory Organization

The HC05B features a linear memory map with:

• $0000-$001F: CPU and peripheral registers
• $0020-$004F: Reserved
• $0050-$00FF: RAM (176 bytes)
• $0100-$1FFF: ROM (size varies by model)
• $1000-$103F: EEPROM (64 bytes)

Peripheral Systems

Timer System

• 16-bit free-running counter with programmable prescaler
• Two input capture channels with edge detection
• Two output compare channels
• Timer overflow interrupt capability

Serial Communications Interface (SCI)

• Full-duplex asynchronous operation
• Programmable baud rate generator
• 8- or 9-bit data format
• Receiver wake-up function for multiprocessor communication

Analog-to-Digital Converter

• 8-channel multiplexed input
• 8-bit resolution
• Programmable conversion clock
• Conversion complete interrupt

Development Support

The HC05B family is supported by:

• Motorola's HC05 assembler and C compilers
• In-circuit emulators
• Evaluation boards
• Flash-based development versions
• Comprehensive technical documentation

Ordering Information

Available variants include:

• MC68HC05B6: 6KB ROM, 176B RAM, 64B EEPROM
• MC68HC05B16: 16KB ROM, 352B RAM, 128B EEPROM
• MC68HC05B32: 32KB ROM, 1024B RAM, 512B EEPROM
• EPROM versions available for development (MC68HC705Bx)

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