HC08A

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HC08A Microcontroller Technical Summary

Overview

The HC08A is a versatile 8-bit microcontroller from Motorola's HC08 family, designed for embedded control applications. It combines high performance with low power consumption, making it suitable for a wide range of industrial, automotive, and consumer applications. The microcontroller features an enhanced M68HC08 architecture with improved memory organization and peripheral integration.

With its comprehensive set of I/O capabilities and built-in peripherals, the HC08A provides an efficient solution for cost-sensitive applications requiring reliable control and processing capabilities. The device includes multiple communication interfaces, analog-to-digital conversion, and flexible timing functions.

Features

• 8-bit M68HC08 CPU core with enhanced instruction set
• 32KB Flash memory with read-while-write capability
• 1KB RAM for data storage and processing
• Multi-function timer module with input capture/output compare
• 10-bit Analog-to-Digital Converter (ADC) with 8 channels
• Controller Area Network (CAN) 2.0B interface
• Serial Peripheral Interface (SPI) and Serial Communication Interface (SCI)
• Up to 56 general-purpose I/O pins with programmable pull-ups
• On-chip clock generator with PLL for flexible clock options
• Low-power modes (Wait and Stop) for power-sensitive applications
• Operating voltage range: 2.7V to 5.5V
• Operating temperature range: -40°C to +85°C

Applications

The HC08A microcontroller is designed for a broad range of embedded control applications, including:

• Automotive control systems (body electronics, lighting control)
• Industrial automation (sensors, actuators, motor control)
• Consumer appliances (white goods, power tools)
• Building automation (HVAC, security systems)
• Medical devices (portable monitoring equipment)
• Point-of-sale terminals and peripheral devices

Pin Assignments and Functions

Power Management Pins

• VDD/VSS: Main power supply (2.7-5.5V) and ground
• VDDA/VSSA: Analog power supply and ground for ADC
• VDDAREF: Analog reference voltage supply

Clock and Reset Pins

• OSC1/OSC2: Crystal oscillator or external clock input
• RST: Active-low reset input with internal pull-up

I/O Ports

• Port A (PTA7-PTA0): General-purpose I/O with interrupt capability
• Port B (PTB7-PTB0): Multiplexed with ADC input channels
• Port C (PTC5-PTC0): General-purpose I/O
• Port D (PTD7-PTD0): General-purpose I/O with high current drive
• Port E (PTE7-PTE0): Multiplexed with serial communication functions
• Port F (PTF6-PTF0): General-purpose I/O with timer functions
• Port G (PTG2-PTG0): Keyboard interrupt inputs
• Port H (PTH1-PTH0): Additional keyboard interrupt inputs

Special Function Pins

• IRQ1: External interrupt input
• CANTx/CANRx: CAN bus transmit and receive
• VREFH/VREFL: ADC reference voltage inputs
• CGMXFC: External filter capacitor for clock generator

Electrical Characteristics

Parameter	Conditions	Min	Typ	Max	Unit
Operating Voltage	Full functionality	2.7	3.3/5.0	5.5	V
Operating Current	8MHz, 5V	-	10	15	mA
Standby Current	Stop mode	-	1	5	µA
Input High Voltage	VDD = 5V	3.5	-	-	V
Input Low Voltage	VDD = 5V	-	-	1.5	V
I/O Pin Sink Current	Single pin	-	-	25	mA
ADC Resolution	10-bit	-	-	±2	LSB

Memory Organization

The HC08A features a linear memory map with the following organization:

• 0000-003F: I/O and control registers
• 0040-00FF: 192 bytes of RAM
• 0100-01FF: Additional 256 bytes of RAM
• 8000-FFFF: 32KB Flash memory (program space)

Package Information

The HC08A is available in multiple package options to suit different application requirements:

• 64-pin QFP (Quad Flat Package): 10mm × 10mm body, 0.5mm pitch
• 52-pin QFP: 10mm × 10mm body, 0.65mm pitch
• 48-pin LQFP (Low-profile QFP): 7mm × 7mm body, 0.5mm pitch

Package Thermal Characteristics

• Thermal resistance (θJA) for 64-pin QFP: 45°C/W
• Maximum junction temperature: 150°C
• Recommended operating temperature: -40°C to +85°C

Development Support

The HC08A is supported by a comprehensive development ecosystem including:

• Evaluation boards with debugging interfaces
• C compiler and assembler toolchains
• In-circuit emulators and debug probes
• Flash programming utilities
• Application notes and reference designs

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