MEC1632 datasheet(95/636 Pages) MICROCHIP

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DS00001592B-page 95

MEC1632

7.0

POWER, CLOCKS, AND RESETS

7.1

General Description

The Power, Clocks, and Resets chapter includes descriptions of the MEC1632 Clock Generator, Power Configuration

and Reset Interface.The Clock Generator, in addition to describing clock sources, also features a Generic Block

Clocking Model and a Power Management Interface.The Reset Interface description includes internal and external

reset sources, as well as descriptions of an internal 1.8V Regulator and Power Mux. Other descriptions in this chapter

include References, a Port List, Interrupt Interface and a Registers Interface.

The Power Configuration, Clock Generator and Reset circuits have the following features:

7.1.1

Power Configuration

7.1.2

Clock Generator

7.1.3

Reset Interface

7.2

References

Advanced Configuration and Power Interface Specification, Revision 1.0b, February 2, 1999.

Intel® 82801DBM I/O Controller Hub 4 Mobile (ICH4-M), Data Sheet, Order Number: 252337-001, Intel Corp.,

January 2003.

PCI Mobile Design Guide, Version 1.1, PCI-SIG, December 18, 1998.

TABLE 7-1:

Power Configuration FEATURES

Feature

Page

Description of Power Supplies and Clocks ACPI Context

121

Enumerated Power Supply Configurations

123

Power-Up Sequence Definition

124

1.8V Regulator

128

Power Mux

129

TABLE 7-2:

Clock Generator FEATURES

Feature

Page

Three asynchronous clock sources: 20 MHz Oscillator, 32K Clock

Domain and PCI_CLK

100

Efficient Logic Design and Controllable Master Clock Trees to Mini-

mize Power Consumption

108

Independent EC-driven Power Management Interface

111

20 MHz Oscillator Optimized for 115.2K baud 16C550A UART Sup-

port

–

Generic Block Clocking Model

105

EC-accessible Registers Interface

130

TABLE 7-3:

Reset Interface FEATURES

Feature

Page

VTR and VBAT Reset Signaling (VTRGD, VBAT_POR, nSYS_RST,

nEC_RST)

124

RESET Pin Interface

126

VCC Reset Signaling (VCC Power Good)

129

Watch-Dog Timer Forced Reset

130

Interrupt Interface

150

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