pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 23

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

Revision 1.07
1.0 Introduction
1.1
This document describes the PC87591x architecture and device specifications. It is organized as follows:
Chapter 1, Introduction, provides an overview of PC87591x modules, system connections, operating modes and configura-
Chapter 2, Signal/Pin Description and Configuration, lists the PC87591x pins and describes their functions and multiplex-
Chapter 3, Power, Reset and Clocks, describes the PC87591x power supplies, clock scheme and reset sequence.
Chapter 4, Embedded Controller Modules, describes the modules that comprise the CompactRISC core peripherals.
Chapter 5, Host Controller Interface Modules, describes the modules and functions that interface core operation with the
Chapter 6, Host-Controlled Modules and Host Interface, defines the configuration and control functions.
Chapter 7, Device Specifications, defines the AC, DC and analog characteristics of the PC87591x.
Appendix A, Summary of Registers, provides a composite listing of all relevant data on core domain registers and summa-
Appendix B, This section includes directions for the software to handle some predetermined hardware interfaces and pro-
1.2
The PC87591x is a highly integrated, embedded controller with an embedded RISC core and system functions. Targeted
for a wide range of portable applications that use the Low Pin Count (LPC) interface, it also features a security system and
host BIOS firmware.
1.2.1
Figure 1 shows the system connections of the PC87591x in a typical mobile PC application. The PC87591x requires little, if
any, system glue elements. For a typical application, the PC87591x includes all required memory and peripherals on-chip.
For more complex applications, it allows simple low-cost expansion, using its bus. Some of the features illustrated are mu-
tually exclusive, depending on pin functions.
The major elements of the PC87591x are:
In addition to the wide range of internal peripherals, the PC87591x provides hooks so that the system can be expanded in
an easy and cost-effective manner, as follows:
1.2.2
The PC87591x has an advanced power management scheme controlled by the host and/or the PC87591x firmware. The
supported SuperI/O functions may be controlled directly by the host, using ACPI compliant schemes. The EC may also in-
terface with the host via one or two communication channels. Power Management events are available for ACPI-compliant
operation with the respective parts of the host chipset.
The PC87591x is designed to operate as the embedded controller of an ACPI-compliant system. It is equipped with various
system power monitor and control functions and advanced means to control its own power consumption and power modes.
ACPI-compliant wake-up and sleep control is integrated into the PC87591x. These functions are powered by V
Embedded Controller (EC) functions, which include: PS/2 devices, keyboard matrix, ACCESS.bus, timers, D/A and
A/D converters and GPIO pins that can be assigned to various functions, as needed. External memory and peripheral
devices may be added to extend the functionality of the on-chip resources.
Host Processor interface based on the LPC bus and additional signals for interrupts and system power management
Power Supplies for Host interface functions, EC and backup battery
Clocks, using a 32.768 KHz crystal and optional clock output
Strap inputs to initialize the PC87591x to different operation modes
I/O expansion to support additional I/O port pins, using low-cost, standard 74HCxx devices or ASICs
On-chip memories may be expanded to interface with external RAM, flash or ROM devices (176-pin package only).
DOCUMENT ORGANIZATION
GENERAL DESCRIPTION
System Connections
Power Management
tion.
ing options.
host.
rizes the registers’ layouts.
vides details of software-to-hardware interface conventions.
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