Intel 430 LF80538NE0301M Data Sheet

Product codes
LF80538NE0301M
Page of 69
Intel
®
 Celeron
®
 M Processor Datasheet
11
Low Power Features
2
Low Power Features
2.1
Clock Control and Low Power States
The Intel
 
Celeron M processor supports the AutoHALT, Stop Grant, Sleep, and Deep Sleep states 
for optimal power management. See 
 for a visual representation of the processor low-
power states.
2.1.1
Normal State
This is the normal operating state for the processor.
2.1.2
AutoHALT Power-Down State
AutoHALT is a low-power state entered when the processor executes the HALT instruction. The 
processor will transition to the Normal state upon the occurrence of SMI#, INIT#, LINT[1:0] 
(NMI, INTR), or FSB interrupt message. RESET# will cause the processor to immediately 
initialize itself.
The return from a System Management Interrupt (SMI) handler can be to either Normal mode or 
the AutoHALT Power-Down state. See the Intel Architecture Software Developer's Manual, 
Volume III: System Programmer's Guide for more information.
Figure 1.  Clock Control States
snoop
occurs
Stop
Grant
Normal
Sleep
HALT/
Grant
Snoop
Auto Halt
Deep
Sleep
STPCLK# asserted
SLP# asserted
SLP# de-asserted
STPCLK# de-asserted
snoop
serviced
HLT
instruction
snoop
serviced snoop
occurs
DPSLP#
de-asserted
DPSLP#
asserted
STPCLK#
asserted
STPCLK#
de-asserted
halt
break
V0001-04
Halt break - A20M#, INIT#, INTR, NMI, PREQ#, RESET#, SMI#, or APIC interrupt