STPCC03 STMicroelectronics, STPCC03 Datasheet - Page 6

• Manufacturer Part Number: STPCC03
• Description: STPC CONSUMER-S DATASHEET- PC COMPATIBLE EMBEDDED MICROPROCESSOR
• Manufacturer: STMicroelectronics

GENERAL DESCRIPTION
state.
- Peripheral activity detection.
- Peripheral timer for detecting lack of peripheral
activity
- SUSP# modulation to adjust the system perform-
ance in various power down states of the system
including full power on state.
- Power control outputs to disable power from dif-
ferent planes of the board.
Lack of system activity for progressively longer
period of times is detected by the three power
down timers. These timers can generate SMI in-
terrupts to CPU so that the SMM software can put
the system in decreasing states of power con-
sumption. Alternatively, system activity in a power
down state can generate SMI interrupt to allow the
software to bring the system back up to full power
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on state. The chip-set supports up to three power
down states: Doze state, Stand-by state and Sus-
pend mode. These correspond to decreasing lev-
els of power savings.
POWER DOWN
Power down puts the STPC Consumer-S into sus-
pend mode. The processor completes execution
of the current instruction, any pending decoded in-
structions and associated bus cycles. During the
suspend mode, internal clocks are stopped. Re-
moving power down, the processor resumes in-
struction fetching and begins execution in the in-
struction stream at the point it had stopped. Be-
cause of the static nature of the core, no internal
data is lost.