20.3.5 Calibration Section

ATtiny102/ATtiny104 have one calibration byte. The calibration byte contains the calibration data for the internal oscillator and resides in the calibration section. During reset, the calibration byte is automatically written into the OSCCAL register to ensure correct frequency of the calibrated internal oscillator.

Table 20-8. Calibration byte
Calibration byteOffset AddressConfiguration word data
High byte [BYTE1]Low byte [BYTE0]
OSCCAL 0x00ReservedOscillator calibration value
Reserved0x01 ... 0x07ReservedReserved