MEC1632 datasheet(111/636 Pages) MICROCHIP

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DS00001592B-page 111

MEC1632

Note 7-19

to shut down EC Clock Tree 0, Host Clock Tree 0 and Host Clock Tree 1 drive the VCC_PWRGD

input pin to ground while the VCC_PWRGD signal function is selected (the default setting for this pin).

7.4.10

POWER MANAGEMENT INTERFACE

7.4.10.1

Overview

The MEC1632 includes several features to help minimize power consumption, the most intrinsic of which is the appli-

cation of advanced gate-level low-power design techniques. The EC can also establish the upper run-time power con-

sumption limit by asserting individual internal block enables (i.e., as described in the Generic Block Clocking Model)

only for functions that are absolutely required during normal operation. Finally, the EC can also dynamically minimize

power consumption by modulating clocks at the block level and within the Clock Generator using the clock gating feature

of the Power Management Interface.

APPLICATION NOTE:

implementing dynamic power management using individual internal block enables alone is

complicated by the fact that, depending on the block implementation, block enables may also

perform a reset function.

There are six EC Controlled Dynamic Power States as described in Section 7.4.10.2, "EC Controlled Dynamic Power

States". These states are achieved using clock gating as described in Section 7.4.10.5, "Clock Gating," on page 115,

which can also affect the 20 MHz Oscillator.

Running and sleeping are the two basic operational modes when considering dynamic power management as defined

by this interface (Figure 7-12). Transitions between these modes are deliberate and persistent. For example, to exit

the full power state the EC must issue a sleep command as described in "EC Controlled Sleep State Activation," on

page 117. Exiting sleep states requires the Wake Interface.

FIGURE 7-12:

MODE TRANSITIONS FOR DYNAMIC POWER MANAGEMENT

FULL

POWER

EC SLEEP

PREPARING

SYSTEM

SLEEP

DEEPEST

SLEEP

HEAVY

SLEEP

LIGHT

SLEEP

SLEEP STATES

EC Sleep Instruction,

SLEEP_FLAG=’0'

Interrupt/Wake Event

SLEEP_FLAG=’1'

EC Sleep Instruction,

No Clocks Required,

Clock Overriode ‘Off’

EC Sleep Instruction,

No Clocks Required,

Clock Override ‘On’

EC Sleep Instruction,

Some Clocks Required

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