LPC47N237-MD View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

LPC47N237-MD

3.3v I/O Controller for Port Replicators and Docking Stations

SMSC -> Microchip 

3.3v I/O Controller for Port Replicators and Docking Stations

PIN#

90

91

66

67

68

69

70

71

72

73

74

75

NAME

(NOTE 4.1)

nRI

nDCD

nINIT

nSLCTIN

PD0

PD1

PD2

PD3

PD4

PD5

PD6

PD7

DESCRIPTION

BUFFER

NAME

(NOTE 4.2)

Active low Ring Indicator inputs for the

I

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.

This pin can be used for wakeup.

Active low Data Carrier Detect inputs for the

I

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.

PARALLEL PORT INTERFACE (17)

This output is bit 2 of the printer control

register. This is used to initiate the printer

when low. Refer to Parallel Port description

for use of this pin in ECP and EPP mode.

Can be configured as an Open-Drain

Output.

OP14

This active low output selects the printer.

This is the complement of bit 3 of the

Printer Control Register. Refer to Parallel

Port description for use of this pin in ECP

and EPP mode.

OP14

Can be Configured as an Open-Drain

Output.

Port Data 0 I/O

IOP14

Port Data 1 I/O

IOP14

Port Data 2 I/O

IOP14

Port Data 3 I/O

IOP14

Port Data 4 I/O

IOP14

Port Data 5 I/O

IOP14

Port Data 6 I/O

IOP14

Port Data 7 I/O

IOP14

PWR

WELL

(NOTE

4.3)

VTR

VCC

VCC

VCC

VCC

VCC

VCC

VCC

VCC

VCC

VCC

VCC

NOTES

(Note 4.7)

SMSC DS – LPC47N237

Page 15

DATASHEET

Revision 0.3 (10-26-04)

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