LPC47M192 datasheet(115/228 Pages) SMSC

115 / 228 page

SMSC DS – LPC47M192

Page 115

Rev. 03/30/05

DATASHEET

QFP

PIN#

DEFAULT

FUNCTION

ALT. FUNC. 1

ALT.

FUNC. 2

ALT.

FUNC. 3

DATA

BIT NO.

OFFSET

(HEX)

GPIO

SMI Output

GPIO

Fan Tachometer 2

GPIO

Fan Tachometer 1

GPIO

Fan Speed Control 2

GPIO

Fan Speed Control 1

Infrared Rx

GPIO

Infrared Tx

GPIO

Keyboard Reset

GPIO

Gate A20

GP3

GPIO

Drive Density Select 0

GPIO

Drive Density Select 1

EETI

GPIO

Power Management

Event

GPIO

Device Disable Reg.

Control

EETI

N/A

Reserved

GP4

7:4

GPIO

Ring Indicator 2

GPIO

Data Carrier Detect 2

GPIO

Receive Serial Data 2

GPIO

Transmit Serial Data 2

GPIO

Data Set Ready 2

GPIO

Request to Send 2

GPIO

Clear to Send 2

100

GPIO

Date Terminal Ready

GP5

GPIO

LED

EETI

GPIO

LED

EETI

N/A

Reserved

GP6

7:2

Note 1:

The GPIO Data and Configuration Registers are located in PME block at the offset shown from

the

PME_BLK address.

7.12.3 GPIO CONTROL

Each GPIO port has an 8-bit control register that controls the behavior of the pin. These registers are defined in the

“Runtime Registers” section of this specification.

Each GPIO port may be configured as either an input or an output. If the pin is configured as an output, it can be

programmed as open-drain or push-pull. Inputs and outputs can be configured as non-inverting or inverting. Bit[0] of

each GPIO Configuration Register determines the port direction, bit[1] determines the signal polarity, and bit[7]

detemines the output driver type select. The GPIO configuration register Output Type select bit[7] applies to GPIO

functions and the nSMI Alternate functions.

The Polarity Bit (bit 1) of the GPIO control registers control the GPIO pin when the pin is configured for the GPIO

function and when the pin is configured for the alternate function for all pins, with the exception of the DDRC function

on GP43, the analog game port pins (J1X, J1Y, J2X, J2Y) and the either edge triggered interrupts. When the

alternate function is selected for the analog joystick pins (GP14, GP15, GP16 and GP17), these pins become open

drain, non-inverted outputs.

The basic GPIO configuration options are summarized in Table 54.

Table 54 - GPIO Configuration Summary

SELECTED

FUNCTION

DIRECTION

BIT

POLARITY

BIT

DESCRIPTION

Pin is a non-inverted output.

Pin is an inverted output.

Pin is a non-inverted input.

GPIO

Pin is an inverted input.

LPC47M192 Datasheet(PDF) 115 Page - SMSC Corporation

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