HC08

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HC08 Microcontroller Technical Summary

Overview

The HC08 is a member of Motorola's M68HC08 Family of microcontrollers, offering enhanced performance while maintaining backward compatibility with the M68HC05 architecture. This 8-bit microcontroller features improved processing capabilities, low power consumption, and a rich instruction set suitable for embedded applications.

Key Features

• 8-bit architecture with 16-bit addressing
• Up to 2MHz bus frequency
• 64KB linear address space
• Enhanced M68HC05 instruction set with additional instructions
• 16-bit index register and stack pointer
• Low-power STOP and WAIT modes
• BCD arithmetic support
• Comprehensive interrupt handling
• Multiple addressing modes

Applications

• Industrial control systems
• Automotive electronics
• Consumer appliances
• Embedded control systems
• Medical devices
• Security systems

Architecture Details

CPU Registers

• Accumulator (A): 8-bit general purpose register
• Index Register (H:X): 16-bit register (H = high byte, X = low byte)
• Stack Pointer (SP): 16-bit register
• Program Counter (PC): 16-bit register
• Condition Code Register (CCR): 8-bit register containing status flags

Memory Organization

The HC08 features a 64KB linear address space with:

• 0000-00FF: Direct page (256 bytes)
• 0100-FFFF: Extended memory
• FFFE-FFFF: Reset vector
• FFFC-FFFD: Interrupt vector

Electrical Characteristics

Parameter	Min	Typ	Max	Unit
Operating Voltage	3.0	5.0	5.5	V
Operating Temperature	-40	25	85	°C
Current Consumption (Active)	-	5	10	mA
Current Consumption (STOP)	-	1	5	μA

Instruction Set Summary

The HC08 features over 150 instructions including:

• Data Transfer: LDA, LDX, STA, STX, MOV
• Arithmetic: ADD, SUB, MUL, DIV, DAA
• Logical: AND, ORA, EOR, COM, NEG
• Bit Manipulation: BSET, BCLR, BRCLR, BRSET
• Control: BRA, BSR, JMP, JSR, RTS
• Stack Operations: PSHA, PSHX, PULA, PULX

Addressing Modes

• Inherent: Operand implied by instruction
• Immediate: Operand included in instruction
• Direct: Operand in first 256 bytes of memory
• Extended: Full 16-bit address specified
• Indexed: Address calculated using index register
• Relative: For branch instructions

Interrupt System

The HC08 features a comprehensive interrupt system with:

• Software interrupt (SWI)
• Hardware interrupt (IRQ)
• Reset interrupt
• Multiple peripheral interrupts

Interrupt processing includes automatic stacking of registers and prioritized handling.

Low Power Modes

• STOP Mode: Lowest power mode, oscillator stopped
• WAIT Mode: Reduced power with CPU halted

Package Information

The HC08 is available in multiple package options including:

• 28-pin PDIP
• 32-pin QFP
• 48-pin QFP
• 64-pin QFP

Development Support

• Full-featured assemblers and compilers
• In-circuit emulators
• Evaluation boards
• Debugging tools

``` This HTML document provides a comprehensive technical summary of the HC08 microcontroller, covering all major aspects of the component including its features, architecture, instruction set, electrical characteristics, and package information. The document is structured with appropriate headings and uses lists and tables for clear presentation of technical data.