The C166 family is a 16-Bit microcontroller architecture from Infineon (formerly the semiconductor division of Siemens) in cooperation with STMicroelectronics

STMicroelectronics

STMicroelectronics is an Italian-French electronics and semiconductor manufacturer headquartered in Geneva, Switzerland.While STMicroelectronics corporate headquarters and the headquarters for EMEA region are based in Geneva, the holding company, STMicroelectronics N.V. is registered in Amsterdam,...

. It was first released in 1993. It uses the well-establied RISC concept, but features some microcontroller-specific extensions such as bit-addressable memory and an interrupt system optimized for low-latency. When this architecture has been introduced the main focus has been to replace 8051

Intel 8051

The Intel MCS-51 is a Harvard architecture, single chip microcontroller series which was developed by Intel in 1980 for use in embedded systems. Intel's original versions were popular in the 1980s and early 1990s. While Intel no longer manufactures the MCS-51, binary compatible derivatives remain...

 controllers (from Intel).

Opcode compatible successors of the C166 family are the C167 family

C167 family

The C167 family is a 16 bit microcontroller architecture from Infineon. It is a further development of the C166 family, which has been brought by Siemens 1993 on the market as controller for measurement and control tasks....

, XC167 family, the XE2000 family and the XE166 family

XE166 family

The Infineon XE166 Family is an 16-bit Microcontroller family, first introduced in 2007. The XE166 can be found in applications like Servo Drivers, Appliance Motors, industrial pumps, transportation and power supplies. -Key features:...

.