12th Generation Intel® Core™ Processors Datasheet, Volume 1 of 2
Integrated Reference Clock PLL
The processor includes a phase lock loop (PLL) that generates the reference clock for the processor from a fixed crystal clock. The processor reference clock is also referred to as Base Clock or BCLK.
By integrating the BCLK PLL into the processor die, a cleaner clock is achieved at a lower power compared to the legacy PCH BCLK PLL solution.
The BCLK PLL has controls for RFI/EMI mitigations as well as Overclocking capabilities.