__CORE__
In this section:
Description
An integer that identifies the chip core in use. The value reflects the setting of the --core option and is defined to __S1__, __S2__, or __S3__. These symbolic names can be used when testing the __CORE__ symbol.
Note
For backward compatibility, this symbol can also be tested against the values __RL78_0__, __RL78_1__, and __RL78_2__.