LPC47M192 datasheet(14/228 Pages) SMSC

14 / 228 page

SMSC DS – LPC47M192

Page 14

Rev. 03/30/05

DATASHEET

QFP PIN#

NAME

DESCRIPTION

BUFFER

NAME

PWR

WELL

NOTES

SERIAL PORT 1 INTERFACE (8)

RXD1

Receiver serial data input for port 1.

VCC

TXD1

Transmit serial data output for port 1.

O12

VCC

nRTS1

Active low Request to Send outputs for the

Serial Port. Handshake output signal notifies

modem that the UART is ready to transmit

data. This signal can be programmed by

writing to bit 1 of the Modem Control

The hardware reset will

reset the nRTS signal to inactive mode

(high). nRTS is forced inactive during loop

mode operation.

VCC

nCTS1

Active low Clear to Send inputs for the serial

port. Handshake signal which notifies the

UART that the modem is ready to receive

data. The CPU can monitor the status of

nCTS signal by reading bit 4 of Modem

Status Register (MSR). A nCTS signal state

change from low to high after the last MSR

read will set MSR bit 0 to a 1. If bit 3 of the

Interrupt Enable Register is set, the interrupt

is generated when nCTS changes state.

The nCTS signal has no effect on the

transmitter.

Note: Bit 4 of MSR is the complement of

nCTS.

VCC

nDTR1

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.

VCC

nDSR1

Active low Data Set Ready input for the

serial port. Handshake signal which notifies

the UART that the modem is ready to

establish the communication link. The CPU

can monitor the status of nDSR signal by

reading bit 5 of Modem Status Register

(MSR). A nDSR signal state change from

low to high after the last MSR read will set

MSR bit 1 to a 1. If bit 3 of Interrupt Enable

when nDSR changes state.

Note: Bit 5 of MSR is the complement of

nDSR.

VCC

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