ST16C580CP40 datasheet(7/41 Pages) EXAR

7 / 41 page

ST16C580

Rev. 1.20

UART’s transmit or receive operation.

-RI

Ring Indicator (active low) - A logic 0 on this pin indicates the

modem has received a ringing signal from the telephone

line. A logic 1 transition on this input pin will generate an

interrupt.

-RTS

Request to Send (active low) - A logic 0 on the -RTS pin

indicates the transmitter has data ready and waiting to send.

Writing a logic 1 in the modem control register (MCR bit-1)

will set this pin to a logic 0 indicating data is available. After

a reset this pin will be set to a logic 1. This pin only affects

the transmit and receive operations when Auto RTS func-

tion is enabled via the Enhanced Feature Register (EFR)

bit-6, for hardware flow control operation.

RX / IRRX

Receive Data - This pin provides the serial receive data

input to the 580. Two user selectable interface options are

available. The first option supports the standard modem

interface. The second option provides an Infrared decoder

interface, see figures 2/3. When using the standard modem

interface, the RX signal will be a logic 1 during reset, idle (no

data), or when the transmitter is disabled. The inactive state

(no data) for the Infrared decoder interface is a logic 0. MCR

bit-6 selects the standard modem or infrared interface.

During the local loop-back mode, the RX input pin is

disabled and TX data is internally connected to the UART

RX Input, internally, see figure 12.

TX / IRTX

Transmit Data - This pin provides the serial transmit data

from the 580. Two user selectable interface options are

available. The first user option supports a standard modem

interface. The second option provides an Infrared encoder

interface, see figures 2/3. When using the standard modem

interface, the TX signal will be a logic 1 during reset, idle (no

data), or when the transmitter is disabled. The inactive state

(no data) for the Infrared encoder/ decoder interface is a

Logic 0. MCR bit-6 selects the standard modem or infrared

interface. During the local loop-back mode, the TX input pin

is disabled and TX data is internally connected to the UART

RX Input, see figure 12.

SYMBOL DESCRIPTION

Symbol

Signal

Pin Description

type

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