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.
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