Eurotech CPU-1450, Руководство пользователя, Страница: 21 / 43

Chapter 4 SPM Management
The Soft Power Management capabilities of the CPU-1450 are integrated in the ICH2 82801 and the Super
I/O PC87364.
The CPU has the capability to be placed in a low-power operating mode where CPU activity is stopped and
power consumption reduced. Operating in this mode is possible by supplying the CPU with the power supply
architecture previously described.
All wake-up event registers and related logic are battery backed-up to retain the configuration of wake-up
events upon a loss of power (i.e., VDD=0V and +5VSB=0V). The battery can be connected through pin 7 (+)
and pin 1 (-) of the
“Multifunction, VGA & Ethernet” connector (J7). The Battery supply voltage must be 3.0 V
(minimum 2.4 V, maximum 4.0 V).
The low power mode can be activated via software, whereas can be deactivated from either the power
button or from one of a number of wake-up events.
The Soft Power Management has a few fundamental points:
Initialise the SPM CPU peripheral to enable wake-up events
Place the CPU in a low-power mode
Waiting for Wake-up events