Hardware support
In this section:
Some RL78 microcontrollers have a hardware multiplier/divider unit. To include runtime support for this unit, use the sample library code provided in the rl78\src\lib\hw_multiply_division_units directory.
Caution
In the IDE, select the Use Hardware Multiplier/Divider Unit option on the Project Options>General Options>Library Configuration page. If the currently selected RL78 device does not have a hardware multiplier/divider unit, this option will not be available.