4
TABLE OF CONTENTS
FEATURES ............................................................................................................................................. 1
GENERAL DESCRIPTION...................................................................................................................... 3
PIN CONFIGURATION............................................................................................................................ 6
DESCRIPTION OF PIN FUNCTIONS...................................................................................................... 7
Buffer Type Descriptions.....................................................................................................................12
Pins That Require External Pullup Resistors.......................................................................................13
3.3 VOLT OPERATION / 5 VOLT TOLERANCE ...................................................................................14
POWER FUNCTIONALITY ....................................................................................................................14
VCC Power .........................................................................................................................................14
VTR Support .......................................................................................................................................14
Internal PWRGOOD............................................................................................................................14
32.768 kHz Trickle Clock Input............................................................................................................14
Indication of 32kHz Clock....................................................................................................................14
Trickle Power Functionality .................................................................................................................15
Maximum Current Values....................................................................................................................17
Power Management Events (PME/SCI)..............................................................................................17
FUNCTIONAL DESCRIPTION...............................................................................................................18
Super I/O Registers.............................................................................................................................18
Host Processor Interface (LPC) ..........................................................................................................18
FLOPPY DISK CONTROLLER..............................................................................................................23
FDC Internal Registers........................................................................................................................23
Command Set/Descriptions.................................................................................................................41
Instruction Set .....................................................................................................................................45
SERIAL PORT (UART) ..........................................................................................................................73
INFRARED INTERFACE........................................................................................................................88
PARALLEL PORT..................................................................................................................................90
POWER MANAGEMENT.....................................................................................................................113
SERIAL IRQ .........................................................................................................................................117
Routable IRQ to Serial IRQ Conversion Capability ...........................................................................121
8042 KEYBOARD CONTROLLER DESCRIPTION.............................................................................122
Keyboard Interface............................................................................................................................122
External Keyboard and Mouse Interface...........................................................................................124
Keyboard Power Management..........................................................................................................124
Interrupts...........................................................................................................................................125
Memory Configurations.....................................................................................................................125
Register Definitions...........................................................................................................................125
External Clock Signal........................................................................................................................125
Default Reset Conditions...................................................................................................................126
Latches On Keyboard and Mouse IRQs............................................................................................129
Keyboard and Mouse PME Generation.............................................................................................131
GENERAL PURPOSE I/O....................................................................................................................132
GPIO Pins.........................................................................................................................................132
Description ........................................................................................................................................133
GPIO Control.....................................................................................................................................136
GPIO Operation ................................................................................................................................137
GPIO PME and SMI Functionality.....................................................................................................138
Either Edge Triggered Interrupts.......................................................................................................140
LED Functionality..............................................................................................................................140