HC05BD3 Technical Summary

Overview

The HC05BD3 is a member of Motorola's 68HC05 microcontroller family, offering a cost-effective, high-performance 8-bit solution for embedded control applications. This microcontroller combines an efficient CPU core with versatile peripheral features, making it suitable for a wide range of industrial and consumer applications. The device is available in multiple variants including MC68HC05BD3 (ROM version), MC68HC705BD3 (EPROM version), and MC68HC05BD5 (expanded ROM version).

Key aspects of the HC05BD3 include its flexible I/O port configuration, integrated memory options, power-saving modes, and robust peripheral set including timers and serial communication interfaces. The architecture is designed for both performance and power efficiency, supporting multiple operating modes to optimize energy consumption.

Features

• 8-bit HC05 CPU Core: Efficient processing with a comprehensive instruction set
• Memory Options: Various configurations available (ROM, EPROM, RAM)
• Versatile I/O Ports: Four configurable I/O ports (Port A, B, C, D)
• Multi-Function Timer: Flexible timing capabilities with multiple operating modes
• Pulse Width Modulation: Hardware PWM support for control applications
• M-BUS Serial Interface: Integrated serial communication capability
• Sync Signal Processor: Enhanced signal processing features
• Low Power Modes: Multiple power-saving options including STOP and WAIT modes
• Operating Voltage Range: Designed for typical 5V operation with robust electrical characteristics
• Comprehensive Reset Options: Multiple reset sources for reliable operation
• Interrupt Capabilities: Flexible interrupt handling with multiple priority levels

Applications

The HC05BD3 microcontroller is suitable for a wide range of applications, including:

• Industrial control systems
• Automotive electronics
• Consumer appliances
• Security systems
• Motor control applications
• Sensor interfaces
• Remote monitoring devices
• Embedded control systems
• Home automation
• Medical devices

Electrical Characteristics

Absolute Maximum Ratings

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

Recommended Operating Conditions

• Supply Voltage (VDD): 4.5V to 5.5V
• Operating Temperature: -40°C to +85°C
• Input High Voltage (VIH): 0.7VDD to VDD
• Input Low Voltage (VIL): -0.3V to 0.3VDD

DC Characteristics

• Input Leakage Current: ±1μA max
• Output Low Voltage (IOL = 5mA): 0.4V max
• Output High Voltage (IOH = -5mA): VDD-0.7V min
• Power Supply Current (active mode): 5mA typical
• Power Supply Current (wait mode): 1mA typical
• Power Supply Current (stop mode): 10μA typical

Package Information

The HC05BD3 is available in multiple package options to suit different application requirements:

Standard Package Options

• 28-pin Plastic Dual In-line Package (PDIP)
  • Package dimensions: 15.24mm x 6.35mm
  • Lead pitch: 2.54mm
  • Operating temperature: -40°C to +85°C
• 28-pin Plastic Leaded Chip Carrier (PLCC)
  • Package dimensions: 11.43mm x 11.43mm
  • Lead pitch: 1.27mm
  • JEDEC standard: MO-047
• 28-pin Small Outline Package (SOIC)
  • Package dimensions: 17.9mm x 7.5mm
  • Lead pitch: 1.27mm
  • JEDEC standard: MS-013

Pin Configuration

The 28-pin configuration provides multiple I/O options and special function pins:

• Port A: 8-bit general purpose I/O port
• Port B: 8-bit general purpose I/O port
• Port C: 4-bit general purpose I/O port with alternate functions
• Port D: 4-bit general purpose I/O port with alternate functions
• Power Pins: VDD (power supply) and VSS (ground)
• Reset: Active-low reset input
• Clock: Oscillator input/output pins
• Interrupt: External interrupt input

Memory Architecture

Memory Map

• ROM Variant (MC68HC05BD3): 4KB mask-programmable ROM
• EPROM Variant (MC68HC705BD3): 4KB erasable programmable ROM
• Expanded ROM Variant (MC68HC05BD5): 8KB mask-programmable ROM
• RAM: 176 bytes (MC68HC05BD3) or 256 bytes (MC68HC705BD3/MC68HC05BD5)
• Bootstrap ROM: Small bootstrap ROM for programming support

Register Set

The HC05BD3 features a comprehensive set of registers for system control and peripheral management:

• Accumulator (A): Primary 8-bit arithmetic register
• Index Register (X): 8-bit index register for addressing modes
• Program Counter (PC): 16-bit program counter
• Stack Pointer (SP): 16-bit stack pointer
• Condition Code Register (CCR): 5-bit status register
• Peripheral Control Registers: Dedicated registers for timer, PWM, and I/O control

Development Support

The HC05BD3 is supported by a range of development tools:

• Assemblers and C compilers
• In-circuit emulators
• Evaluation boards
• Flash programming tools
• Debugging interfaces

Note: All products are sold subject to Motorola's Terms & Conditions of Supply. Customers ordering products covered by this documentation agree to be bound by these terms.