12th Generation Intel® Core™ Processors Datasheet, Volume 1 of 2
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By default, the PROCHOT# signal is set to input only. When configured as an input or bi-directional signal, PROCHOT# can be used for thermally protecting other platform components should they overheat as well. When PROCHOT# is driven by an external device:
- The package will immediately transition to the lowest P-State (Pn) supported by the processor IA cores and graphics cores. This is contrary to the internally-generated Adaptive Thermal Monitor response.
- Clock modulation is not activated.
The processor package will remain at the lowest supported P-state until the system de-asserts PROCHOT#. The processor can be configured to generate an interrupt upon assertion and de-assertion of the PROCHOT# signal.
When PROCHOT# is configured as a bi-directional signal and PROCHOT# is asserted by the processor, it is impossible for the processor to detect a system assertion of PROCHOT#. The system assertion will have to wait until the processor de-asserts PROCHOT# before PROCHOT# action can occur due to the system assertion. While the processor is hot and asserting PROCHOT#, the power is reduced but the reduction rate is slower than the system PROCHOT# response of < 100 us. The processor thermal control is staged in smaller increments over many milliseconds. This may cause several milliseconds of delay to a system assertion of PROCHOT# while the output function is asserted.