The MC68HC908QY4ACDT is an 8-bit microcontroller from Freescale Semiconductor (now NXP), belonging to the HC08 family. This microcontroller is designed for low-cost, high-performance embedded control applications. The QY4 variant is particularly suited for applications requiring a compact size and low power consumption, while still offering a useful set of peripherals and memory.

Applications

• Small appliances: Control of simple functions in devices like coffee makers, toasters, and blenders.
• Remote controls: Handling button inputs and transmitting signals in remote control systems.
• Toys: Controlling motors, lights, and sound effects in electronic toys.
• Low-end industrial control: Monitoring sensors and controlling basic actuators in industrial environments.
• Security systems: Simple alarm systems and access control devices.

Features

• HC08 CPU core: An efficient 8-bit processor optimized for control applications.
• 4 KB of Flash memory: For program storage, offering in-system programmability.
• 256 bytes of RAM: Provides working memory for data manipulation.
• 8-channel, 8-bit Analog-to-Digital Converter (ADC): Allows for the measurement of analog signals from sensors.
• Serial Communications Interface (SCI): Facilitates asynchronous serial communication with other devices.
• Timer/PWM module: Used for timing, counting, and pulse width modulation for motor control or other applications.
• 16 GPIO pins: Provide flexible digital input and output capabilities.

Benefits

• Low cost: Makes it suitable for high-volume, cost-sensitive applications.
• Low power consumption: Extends battery life in portable devices.
• Small size: Enables integration into compact products.
• Easy to program: Supported by Freescale's development tools.
• Versatile peripherals: The built-in ADC, SCI, and timer modules cater to a range of application needs.

Additional Details

The MC68HC908QY4ACDT operates at a clock speed of up to 8 MHz. It features a low-voltage inhibit (LVI) circuit to prevent operation at voltages below the specified minimum, ensuring data integrity. The available interrupt sources enhance responsiveness to external events. The flash memory is reprogrammable, allowing for field updates or customization. The SCI module supports various communication protocols, including UART. The timer/PWM module can be configured for a variety of functions, including generating PWM signals for motor control, measuring pulse widths, and generating interrupts at specific time intervals. The MCU is available in a small outline package, making it suitable for space-constrained applications. The integrated ADC allows for the direct measurement of analog signals without the need for external components, simplifying the design and reducing the overall system cost.