Intel 2 Duo E7300 AT80571PH0673M Data Sheet

Datasheet

83

The PROCHOT# signal is asserted when a high temperature situation is detected, 

regardless of whether Thermal Monitor or Thermal Monitor 2 is enabled.

It should be noted that the Thermal Monitor 2 TCC cannot be activated using the on-

demand mode. The Thermal Monitor TCC, however, can be activated through the use of 

the on-demand mode.

The processor provides an auxiliary mechanism that allows system software to force 

the processor to reduce its power consumption. This mechanism is referred to as “On-

Demand” mode and is distinct from the Thermal Monitor feature. On-Demand mode is 

intended as a means to reduce system level power consumption. Systems using the 

processor must not rely on software usage of this mechanism to limit the processor 

temperature.

If bit 4 of the ACPI P_CNT Control Register (located in the processor 

IA32_THERM_CONTROL MSR) is written to a '1', the processor will immediately reduce 

its power consumption using modulation (starting and stopping) of the internal core 

clock, independent of the processor temperature. When using On-Demand mode, the 

duty cycle of the clock modulation is programmable using bits 3:1 of the same ACPI 

P_CNT Control Register. In On-Demand mode, the duty cycle can be programmed from 

12.5% on/87.5% off, to 87.5% on/12.5% off in 12.5% increments. On-Demand mode 

may be used in conjunction with the Thermal Monitor. If the system tries to enable On-

Demand mode at the same time the TCC is engaged, the factory configured duty cycle 

of the TCC will override the duty cycle selected by the On-Demand mode. 

VID

Frequency

Temperature

T

TM2

f

MAX

f

TM2

VID

VID

TM2

PROCHOT#