Motorola 68HC08

The 68HC08 (also abbreviated as HC08) is a broad family of 8-bit microcontrollers from Motorola Semiconductor (later from Freescale then NXP).

HC08's are fully code-compatible with their predecessors, the Motorola 68HC05. Like all Motorola processors that share lineage from the 6800, they use the von Neumann architecture as well as memory-mapped I/O. This family has five CPU registers that are not part of the memory. One 8-bit accumulator A, a 16-bit index register H:X, a 16-bit stack pointer SP, a 16-bit program counter PC, and an 8-bit condition code register CCR. Some instructions refer to the different bytes in the H:X index register independently.

Among the HC08's there are dozens of processor families, each targeted to different embedded applications. Features and capabilities vary widely, from 8 to 64-pin processors, from LIN connectivity to USB 1.1. A typical and general purpose device from the HC08 family of units is the microcontroller M68HC908GP32.

The Freescale RS08 core is a simplified, "reduced-resource" version of the HC08.

The Freescale HCS08 core is the next generation of the same processors.

External links

• M68HC08 Family Reference Manual - archive.org
• HC08 Processor Families
• Helium Open-Source RTOS for HCS08 MCUs
• Digital Core Design 68HC08 - HDL IP Core
• Win/Linux/DOS-based freeware macro cross-assembler (ASM8)
• Example assembly language code written for ASM8
• Educational material for the HC08

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