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armembeddedinteger-divisioncortex-m

Divide by zero exception on M0+ devices

Is there a Divide by zero exception on M0+ devices?

I know Cortex M3 and M4 devices have this.

Solution

  • Cortex-M0+ is ARMv6-M which does not include a divide instruction, so there will be no hardware exception for that. Since division would necessarily be a software operation, it would be for the software implementation for trap divide-by-zero. The behaviour will therefore be down to your compiler; for C and C++ at least it is undefined behaviour.