The MC68HC705H12CFN is an 8-bit microcontroller unit (MCU) that is part of the Motorola (now NXP Semiconductors) 68HC05 family. This particular variant is now manufactured by Rochester Electronics, specializing in providing long-term support for end-of-life semiconductors. It's designed for various embedded control applications.

Applications

• Automotive Electronics: Applications such as remote keyless entry systems, anti-theft alarms, and simple engine control units.
• Consumer Electronics: Utilized in remote controls, small appliances, and toys.
• Industrial Control Systems: Used in basic automation systems, motor control, and sensor interfaces.
• Medical Devices: Incorporated into small, portable medical devices such as blood glucose meters.
• Security Systems: Used in basic alarm systems and access control systems.

Features

• 8-bit CPU: Based on the 68HC05 core, providing a simple and efficient instruction set.
• 12KB EPROM: Offers non-volatile memory for program storage.
• 352 Bytes of RAM: Provides temporary storage for data during program execution.
• 20 Programmable I/O Lines: Allows for versatile interfacing with external devices.
• 8-bit Timer with Prescaler: Provides timing and counting functions.
• Serial Communications Interface (SCI): Supports asynchronous serial communication.
• On-Chip Oscillator: Eliminates the need for external clock components.

Benefits

• Simple and Easy to Use: Straightforward architecture and instruction set simplifies programming.
• Low Power Consumption: Suitable for battery-powered applications.
• Versatile I/O Capabilities: Allows interfacing with a wide range of external devices.
• Cost-Effective Solution: Provides a cost-efficient solution for basic embedded control.
• Reliable Performance: Proven architecture and robust design ensure reliable operation.
• Long-Term Availability: Rochester Electronics ensures continued availability of this legacy device.

Specific Details: The MC68HC705H12 typically operates at a clock frequency of around 4 MHz. It supports various interrupt sources, including timer overflow and SCI. The package type is a PLCC (Plastic Leaded Chip Carrier). Detailed specifications, including memory map, interrupt vectors, and pinout, are available in the Rochester Electronics datasheet.