HC05DX

HC05DX Microcontroller Technical Summary

Overview

The HC05DX is a versatile 8-bit microcontroller family from Motorola (now NXP) featuring variants including the MC68HC05D24, MC68HC05D32, and MC68HC705D32. These devices combine a high-performance CPU core with integrated peripherals, making them suitable for embedded control applications. The architecture provides an optimal balance of processing power, memory resources, and I/O capabilities while maintaining low power consumption.

Key aspects of the HC05DX family include:

• 8-bit HC05 CPU core with enhanced instruction set
• On-chip memory configurations varying by specific model
• Multiple low-power modes for energy-sensitive applications
• Comprehensive peripheral set including timers, serial interfaces, and PWM
• Robust reset and interrupt handling capabilities

Features

Core Features

• Fully static 8-bit HC05 CPU design
• Upward compatible instruction set with M68HC05 family
• 16-bit stack pointer with stack manipulation instructions
• Memory-mapped I/O registers
• Multiple addressing modes including direct, extended, indexed, and relative

Memory Features

• Varying ROM/EPROM sizes (model dependent):
  • MC68HC05D24: 24KB ROM
  • MC68HC05D32: 32KB ROM
  • MC68HC705D32: 32KB EPROM
• 512 bytes to 1KB RAM (model dependent)
• Memory expansion capability on select models

Peripheral Features

• Parallel I/O ports with configurable direction control
• Programmable timer subsystem with input capture/output compare
• Serial Communications Interface (SCI) for UART functionality
• Pulse Width Modulation (PWM) unit with 8-bit resolution
• Watchdog timer for system reliability

System Features

• Multiple reset sources (power-on, external, watchdog)
• Comprehensive interrupt structure with priority control
• STOP and WAIT low-power modes
• On-chip clock generator with optional external oscillator

Applications

The HC05DX microcontroller family is designed for a wide range of embedded control applications, including:

• Industrial control systems
• Automotive electronics
• Consumer appliances
• Security systems
• Medical devices
• HVAC control
• Power management systems
• Motor control applications
• Sensor interfaces
• Remote monitoring 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 (5V operation)
• Supply Voltage (VDD): 2.7V to 5.5V (low voltage operation)
• Operating Temperature: -40°C to +85°C (industrial)
• Clock Frequency: DC to 4MHz (5V), DC to 2MHz (3V)

Power Consumption

• Active Mode (4MHz, 5V): 10mA typical
• Wait Mode (4MHz, 5V): 2.5mA typical
• Stop Mode (5V): 50μA maximum

I/O Characteristics

• Input High Voltage (VIH): 0.7VDD min
• Input Low Voltage (VIL): 0.2VDD max
• Output High Voltage (IOH = -1mA): VDD-0.5V min
• Output Low Voltage (IOL = 5mA): 0.4V max
• Input Leakage Current (any pin): ±1μA max

Package Information

The HC05DX family is available in multiple package options to suit different application requirements:

Plastic Dual In-line Package (PDIP)

• 40-pin configuration
• 0.6" wide body
• Lead pitch: 0.1" (2.54mm)
• Operating temperature: -40°C to +85°C

Plastic Leaded Chip Carrier (PLCC)

• 44-pin configuration
• JEDEC standard footprint
• Lead pitch: 0.05" (1.27mm)
• Surface mount compatible

Shrink Small Outline Package (SSOP)

• 44-pin configuration
• 0.209" body width
• Lead pitch: 0.0256" (0.65mm)
• Low-profile surface mount package

Ordering Information

The HC05DX family offers several ordering options based on memory configuration, package type, and temperature range. The standard part numbering scheme is as follows:

• MC68HC05D24: 24KB ROM version
• MC68HC05D32: 32KB ROM version
• MC68HC705D32: 32KB EPROM version

Suffix codes indicate package type and temperature range:

• P: 40-pin PDIP (commercial temperature)
• FN: 44-pin PLCC (industrial temperature)
• DW: 44-pin SSOP (extended temperature)

Development Support

Motorola (now NXP) provides comprehensive development support for the HC05DX family, including:

• Evaluation boards and starter kits
• In-circuit emulators
• C compilers and assemblers
• Debugging tools
• Application notes and technical documentation

Conclusion

The HC05DX microcontroller family offers a robust combination of processing power, integrated peripherals, and flexible memory options suitable for a wide range of embedded control applications. With its low-power capabilities, comprehensive peripheral set, and multiple package options, the HC05DX provides designers with a versatile solution for cost-sensitive applications requiring reliable 8-bit performance.