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LPC47N227TQFP

100 Pin Super I/O with LPC Interface for Notebook Applications

SMSC -> Microchip 

TQFP/STQFP

PIN #

NAME

89

Data Terminal

Ready 1

100

Data Terminal

Ready 2

90

Ring

Indicator 1

(Note 8)

92

Ring

Indicator 2

(Note 8)

91

Data Carrier

Detect 1

94

Data Carrier

Detect 2

95

Receive Data 2

96

Transmit

Data 2

61

IR Receive

62

IR Transmit

63

IR Mode/

IR Receive 3

SYMBOL

nDTR1

nDTR2

nRI1

nRI2

nDCD1

nDCD2

BUFFER

TYPE PER

FUNCTION1

O6

O6

I

I

I

I

DESCRIPTION

Active low Data Terminal Ready outputs for the

serial port. Handshake output signal notifies

modem that the UART is ready to establish data

communication link. This signal can be

programmed by writing to bit 0 of Modem Control

Register (MCR). The hardware reset will reset the

nDTR signal to inactive mode (high). nDTR is

forced inactive during loop mode operation.

Active low Ring Indicator inputs for the serial port.

Handshake signal which notifies the UART that the

telephone ring signal is detected by the modem.

The CPU can monitor the status of nRI signal by

reading bit 6 of Modem Status Register (MSR). A

nRI signal state change from low to high after the

last MSR read will set MSR bit 2 to a 1. If bit 3 of

Interrupt Enable Register is set, the interrupt is

generated when nRI changes state.

Note: Bit 6 of MSR is the complement of nRI.

Active low Data Carrier Detect inputs for the serial

port. Handshake signal which notifies the UART

that carrier signal is detected by the modem. The

CPU can monitor the status of nDCD signal by

reading bit 7 of Modem Status Register (MSR). A

nDCD signal state change from low to high after

the last MSR read will set MSR bit 3 to a 1. If bit 3

of Interrupt Enable Register is set, the interrupt is

generated when nDCD changes state.

Note: Bit 7 of MSR is the complement of nDCD.

RXD2

IS

Receiver serial data input for port 2. IR Receive

Data.

TXD2

O12

Transmit serial data output for port 2. IR transmit

data.

INFRARED INTERFACE

IRRX2

IS

IR Receive.

IRTX2

O12

IR Transmit.

IRMODE/

O6/

IR mode.

IRRX3

IS

IR Receive 3.

PARALLEL PORT INTERFACE (NOTE 3)

8

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