View source for Engineering:Motorola 68HC08

{{Short description|Microcontroller}}
The '''68HC08''' ('''HC08''' in short) is a broad family of [[8-bit|8-bit]] [[Engineering:Microcontroller|microcontroller]]s originally from [[Company:Motorola|Motorola]] Semiconductor, later from [[Company:Freescale Semiconductor|Freescale Semiconductor]].

HC08's are fully code-compatible with their predecessors, the [[Engineering:Motorola 68HC05|Motorola 68HC05]].  Like all Motorola processors that share lineage from the 6800, they use the [[Von Neumann architecture|von Neumann architecture]] as well as memory-mapped I/O.  This family has five CPU [[Processor register|register]]s that are not part of the memory.  One 8-bit [[Accumulator (computing)|accumulator]] A, a 16-bit [[Index register|index register]] H:X, a 16-bit stack pointer SP, a 16-bit [[Program counter|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 [[Local Interconnect Network|LIN]] connectivity to [[Engineering:USB|USB]] 1.1. A typical and general purpose device from the HC08 family of units is the  microcontroller [http://electronics.physics.auth.gr/microcon/ M68HC908GP32].

The [[Engineering:Freescale RS08|Freescale RS08]] core is a simplified, "reduced-resource" version of the HC08.

The [[Engineering:Freescale S08|Freescale HCS08]] core is the next generation of the same processors.

== External links ==
* [https://archive.org/details/bitsavers_motorola68tralProcessorUnitReferenceManualRev11994_11429498 M68HC08 Family Reference Manual] - archive.org
* [https://www.nxp.com/products/processors-and-microcontrollers/legacy-mcu-mpus/8-bit-legacy-mcus:8-BIT-LEGACY-MCUS?&lang=en&lang_cd=en& HC08 Processor Families]
* [http://helium.sourceforge.net Helium Open-Source RTOS for HCS08 MCUs]
* [https://web.archive.org/web/20110728214131/http://www.dcd.pl/acore.php?idcore=82 Digital Core Design 68HC08 - HDL IP Core]
* [http://www.aspisys.com/asm8.htm Win/Linux/DOS-based freeware macro cross-assembler (ASM8)]
* [http://www.aspisys.com/code Example assembly language code written for ASM8]
* [http://electronics.physics.auth.gr/microcon Educational material for the HC08]

{{Motorola_microcontrollers}}
{{8bitMCUs}}

[[Category:Microcontrollers]]


{{Sourceattribution|Motorola 68HC08|1}}