LPC61W492 Ver la hoja de datos (PDF) - SMSC -> Microchip

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LPC61W492

Integrated Super I/O Controller for LPC Bus with Game and MIDI Ports/Plus Hardware Monitoring Functions

SMSC -> Microchip 

Serial Port Interface

SYMBOL

PIN

nCTSA

49

nCTSB

78

nDSRA

50

nDSRB

79

nRTSA

51

HEFRAS

nRTSB

80

nDTRA

52

nPNPCSV

nDTRB

81

SINA

53

SINB

82

SOUTA

54

PENKBC

SOUTB

83

PEN48

nDCDA

56

nDCDB

84

nRIA

57

nRIB

85

I/O

INt

INt

I/O8t

I/O8t

I/O8t

I/O8t

INt

I/O8t

I/O8t

INt

INt

FUNCTION

Clear To Send. It is the modem control input.

The function of these pins can be tested by reading bit 4 of

the handshake status register.

Data Set Ready. An active low signal indicates the modem

or data set is ready to establish a communication link and

transfer data to the UART.

UART A Request To Send. An active low signal informs the

modem or data set that the controller is ready to send data.

During power-on reset, this pin is pulled down internally and

is defined as HEFRAS, which provides the power-on value

for CR26 bit 6 (HEFRAS). A 4.7 k" is recommended if

intends to pull up. (select 370H as configuration I/O port$s

address)

UART B Request To Send. An active low signal informs the

modem or data set that the controller is ready to send data.

UART A Data Terminal Ready. An active low signal informs

the modem or data set that the controller is ready to

communicate.

During power-on reset, this pin is pulled down internally and

is defined as nPNPCSV, which provides the power-on value

for CR24 bit 0 (nPNPCSV). A 4.7 k" is recommended if

intends to pull up. (clear the default value of FDC, UARTs,

and PRT)

UART B Data Terminal Ready. An active low signal informs

the modem or data set that controller is ready to

communicate.

Serial Input. It is used to receive serial data through the

communication link.

UART A Serial Output. It is used to transmit serial data out to

the communication link.

During power-on reset, this pin is pulled down internally and

is defined as PENKBC, which provides the power-on value

for CR24 bit 2 (ENKBC). A 4.7 k" resistor is recommended if

intends to pull up. (enable KBC)

UART B Serial Output. During power-on reset, this pin is

pulled down internally and is defined as PEN48, which

provides the power-on value for CR24 bit 6 (EN48). A 4.7 k

" resistor is recommended if intends to pull up.

Data Carrier Detect. An active low signal indicates the

modem or data set has detected a data carrier.

Ring Indicator. An active low signal indicates that a ring

signal is being received from the modem or data set.

16

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