Freescale RS08
microprocessor series
RS08 is a family of 8-bit microcontrollers by NXP Semiconductors. Originally released by Freescale in 2006, the RS08 architecture is a reduced-resource version of the Freescale MC68HCS08 central processing unit (CPU), a member of the 6800 microprocessor family. It has been implemented in several microcontroller devices for embedded systems.
Compared to its sibling HC08 and Freescale S08 parts, it has a much-simplified design. The 'R' in its part numbers suggests "Reduced"; Freescale itself describes the core as "ultra-low-end". Typical implementations include fewer on-board peripherals and memory resources, have smaller packages (the smallest is the QFN6 package, at 3mm x 3mm x 1mm), and are priced under US$1. Aims of the simplified design include greater efficiency, greater cost-effectiveness for small-memory-size parts, and smaller die size.
The RS08 employs a von Neumann architecture with shared program and data bus; executing instructions from within data memory is possible. The device is not binary compatible with the S08 core, though the instruction opcodes and addressing modes are a subset of the S08. This allows an easy transition from the S08 core to the RS08 core for designers and engineers.
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