FDC37C669 datasheet(9/164 Pages) SMSC

9 / 164 page

DESCRIPTION OF PIN FUNCTIONS

QFP/

TQFP

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

Transmit Data 2

TXD2/IRTX

O24

Transmit serial data output for port 2. IR

transmit data.

Receive Data 1

RXD1

Reciever serial data input for port 1.

Transmit Data 1

TXD1

024

Transmit serial data output for port 1.

81,91

nRequest to

Send

(System Option)

nRTS1

nRTS2

(SYSOPT)

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

programmed by writing to bit 1 of Modem

Control Register (MCR).

The hardware

reset will reset the nRTS signal to inactive

mode (high).

Forced inactive during loop

mode operation.

At the trailing edge of hardware reset, the

nRTS2 input is latched to determine the

configuration base address.

0 : INDEX Base I/O Address = 3F0 Hex

1 : INDEX Base I/O Address = 370 Hex

83,93

nData Terminal

Ready

nDTR1

nDTR2

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).

Forced inactive

during loop mode operation.

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