Intel 1.00 GHz BX80530F1000256 Data Sheet

Product codes

BX80530F1000256

Datasheet

Intel

Celeron

Processor up to 1.10 GHz

2.2.1

Normal State—State 1

This is the normal operating state for the processor.

2.2.2

AutoHALT Power Down State—State 2

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#, BINIT#, INIT#, or
LINT[1:0] (NMI, INTR). 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 (Order Number 243192) for more information.

FLUSH# will be serviced during the AutoHALT state, and the processor will return to the
AutoHALT state.

The system can generate a STPCLK# while the processor is in the AutoHALT Power Down state.
When the system deasserts the STPCLK# interrupt, the processor will return execution to the
HALT state.

Figure 1. Clock Control State Machine

2. Auto HALT Power Down State

BCLK running.
Snoops and interrupts allowed.

4. Auto HALT Power Down State

BCLK running.
Snoops and interrupts allowed.

Snoop
Event
Occurs

Snoop
Event
Serviced

HALT Instruction and
HALT Bus Cycle generated

INIT#, BINIT#, INTR, SMI#,
RESET#

Snoop event occurs

Snoop event serviced

1. Normal State

Normal execution.

3. Stop Grant State

BCLK running.
Snoops and interrupts allowed.

STPCLK#
asserted

STPCLK#
deasserted

5. Sleep State

BCLK running.
Snoops and interrupts allowed.

SLP#
asserted

SLP#
deasserted

6. Deep Sleep State

BCLK stopped.
No Snoops and interrupts allowed.

BCLK
input
stopped

BCLK
input
restarted

STPCLK# Deasserted
and Stop Grant entered
from Auto HALT.