The MC68HC705P9CP is an 8-bit microcontroller from Freescale Semiconductor (now NXP Semiconductors). It belongs to the HC05 family and is designed for a wide range of embedded control applications. This microcontroller features a CPU, RAM, EEPROM, and various peripherals, making it a versatile solution for both simple and moderately complex control tasks.

Applications

• Remote Controls: Used in infrared (IR) and radio frequency (RF) remote control systems.
• Security Systems: Implements control logic for alarms, sensors, and access control systems.
• Consumer Electronics: Found in appliances, toys, and other electronic devices.
• Industrial Control: Used in motor control, process automation, and data acquisition systems.
• Automotive Applications: Provides control functions in vehicle systems, such as lighting and door locks.

Features

• 8-Bit CPU (HC05 Core): Provides a processing capability for executing control algorithms.
• 4KB EEPROM: Offers non-volatile memory for storing program code and data.
• 176 Bytes of RAM: Provides temporary storage for variables and data during program execution.
• 16 Input/Output (I/O) Pins: Allows for interfacing with external devices and sensors.
• 8-Bit Timer/Counter: Used for timing and counting events.
• Serial Communication Interface (SCI): Enables communication with other devices using serial protocols.
• Analog-to-Digital Converter (ADC): Converts analog signals from sensors into digital values.
• Low-Power Operation: Designed for low power consumption to extend battery life in portable applications.

Benefits

• Flexible Control: Provides versatile control capabilities for a wide range of applications.
• On-Chip Memory: Reduces the need for external memory components, simplifying the design.
• Integrated Peripherals: Offers a comprehensive set of peripherals for interfacing with external devices.
• Low Cost: Provides a cost-effective solution for embedded control applications.
• Easy to Program: Supports standard programming languages and development tools.

Additional Details

The MC68HC705P9CP operates with a clock frequency of up to 4 MHz. It features a programmable timer with interrupt capabilities, allowing for precise timing and control. The SCI module supports asynchronous communication, enabling data transfer with other devices such as computers and sensors. The ADC module provides 8-bit resolution, allowing for accurate conversion of analog signals. The microcontroller is available in a DIP (Dual In-line Package) for easy prototyping and development. Key specifications include operating voltage (typically 3V to 5.5V), operating temperature range (-40°C to +85°C), and current consumption. The device is commonly used in applications where a small size, low power consumption, and cost-effectiveness are critical requirements. The CPU instruction set is based on the 6805 architecture, which is well-documented and supported by a wide range of development tools.