RJ80535 Intel, RJ80535 Datasheet - Page 11

• Manufacturer Part Number: RJ80535
• Description: Pentium M Processor
• Manufacturer: Intel

2
2.1
2.1.1
2.1.2
Intel
®
Figure 1. Clock Control States
Pentium
®
Low Power Features
Clock Control and Low Power States
The Intel Pentium M processor supports the AutoHALT, Stop-Grant, Sleep, Deep Sleep, and
Deeper Sleep states for optimal power management. See
processor low-power states.
Normal State
This is the normal operating state for the processor.
AutoHALT Powerdown State
AutoHALT is a low-power state entered when the processor executes the HALT instruction. The
processor transitions to the Normal state upon the occurrence of SMI#, INIT#, LINT[1:0] (NMI,
INTR), or PSB interrupt message. RESET# will cause the processor to immediately initialize itself.
A System Management Interrupt (SMI) handler will return execution to either Normal state or the
AutoHALT Powerdown state. See the Intel Architecture Software Developer's Manual, Volume III:
System Programmer's Guide for more information.
The system can generate a STPCLK# while the processor is in the AutoHALT Powerdown state.
When the system deasserts the STPCLK# interrupt, the processor will return execution to the
HALT state.
M Processor Datasheet
break
halt
Auto Halt
Normal
instruction
Halt break - A20M#, INIT#, INTR, NMI, PREQ#, RESET#, SMI#, or APIC interrupt
HLT
STPCLK# de-asserted
STPCLK# asserted
STPCLK#
asserted
serviced
de-asserted
occurs
snoop
snoop
STPCLK#
serviced
snoop
Snoop
HALT/
Grant
Grant
Stop
occurs
snoop
V0001-04
SLP# de-asserted
SLP# asserted
Deeper
Sleep
Figure 1
core voltage raised
core voltage lowered
de-asserted
DPSLP#
for a visual representation of the
Low Power Features
Sleep
Sleep
Deep
DPSLP#
asserted
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