The C166 family is a 16-bit microcontroller architecture from Infineon (formerly the semiconductor division of Siemens) in cooperation with STMicroelectronics. It was first released in 1993 and is a controller for measurement and control tasks. It uses the well-established RISC architecture, but features some microcontroller-specific extensions such as bit-addressable memory and an interrupt system optimized for low-latency. When this architecture was introduced the main focus was to replace 8051 controllers (from Intel).
Opcode compatible successors of the C166 family are the C167 family, XC167 family, the XE2000 family and the XE166 family.
C167 / ST10 family 
The Siemens/Infineon C167 family or STMicroelectronics ST10 family  is a further development of the C166 family. It has improved addressing modes and support for "atomic" instructions. Variants include, for example, Controller Area Network (CAN bus).
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