Datasheet
ATmega164A/PA/324A/PA/644A/PA/1284/P
2018 Microchip Technology Inc. Data Sheet Complete DS40002070A-page 568
Figure 31-29. ATmega164PA: Bandgap voltage vs. temperature
31.1.8 Internal oscillator speed
Figure 31-30. ATmega164PA: Watchdog oscillator frequency vs. temperature
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