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AURIX™ MCU: FPU activation in the TriCore™ CPU – KBA234557

AURIX™ MCU: FPU activation in the TriCore™ CPU – KBA234557

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Community Translation: AURIX™ MCU: TriCore™ CPUのFPUアクティベーション – KBA234557

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Question: Is it necessary to activate the Floating Point Unit (FPU) of the TriCore™ CPU?

Answer: It is not necessary to enable the FPU, but to utilize it, the compiler needs to generate code for the FPU HW. The distinction to use either the fixed point arithmetic or the FPU is done via the instruction which is used. Most compilers use their floating point libraries as default, which assumes that there is no FPU. TriCore™ supports single-precision floating point.

See the "Floating Point Unit (FPU)” section in the TriCore TC1.6.2 core architecture manual (volume 1) and "FPU Instruction" section in the TriCore TC1.6.2 core architecture manual - Instruction set (volume 2) for more details.

Note: This KBA applies to the following series of AURIX™ microcontrollers:

  • AURIX™ TC2xx series
  • AURIX™ TC3xx series.
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