The MC68HC705BD3P is an 8-bit microcontroller unit (MCU) from the M68HC05 family, now manufactured by Rochester Electronics. This device is based on the popular M6805 architecture and is designed for a wide range of embedded control applications. Rochester Electronics continues to manufacture this part, ensuring its availability for long-term projects and legacy systems.

Applications:

• Industrial Control Systems: Used in various industrial automation and control applications.
• Consumer Electronics: Found in appliances, remote controls, and other consumer products.
• Automotive Systems: Employed in simple automotive control functions.
• Instrumentation: Utilized in measurement and instrumentation equipment.
• Legacy System Support: Ideal for maintaining and repairing older systems that rely on this specific MCU.

Features:

• 8-Bit CPU: Based on the M6805 instruction set.
• On-Chip Memory: Includes both ROM/EPROM and RAM.
• I/O Ports: Multiple programmable input/output ports for interfacing with external devices.
• Timer/Counter: Features an integrated timer/counter for timing and control functions.
• Serial Communication Interface: Supports serial communication protocols.
• Low Power Consumption: Designed for low-power applications.

Benefits:

• Versatile Architecture: Suitable for a wide range of embedded control applications.
• Cost-Effective Solution: Provides a balance of performance and cost.
• Easy to Program: Well-documented instruction set and development tools available.
• Reliable Performance: Proven architecture for stable and reliable operation.
• Long-Term Availability: Manufactured by Rochester Electronics, ensuring continued supply.

Technical Specifications:

The MC68HC705BD3P typically operates at a clock frequency of around 2 MHz. It features on-chip ROM/EPROM for program storage and RAM for data storage. The number of I/O ports varies depending on the specific package. The timer/counter provides programmable timing intervals. The serial communication interface supports asynchronous communication. The device is packaged in a DIP or SOIC package for easy integration into circuit boards. It requires a single 5V power supply. The microcontroller also includes interrupt capabilities for responding to external events.