ST16C580(2005) Просмотр технического описания (PDF) - Exar Corporation

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ST16C580
(Rev.:2005)

UART WITH 16-BYTE FIFO’s AND INFRARED (IrDA) ENCODER/DECODER

Exar Corporation 

ST16C580

SYMBOL DESCRIPTION

Symbol

-RI

-RTS

RX / IRRX

TX / IRTX

Pin

Signal

48 type

Pin Description

41

I 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.

32

O 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.

7

I Receive Data - This pin provides the serial receive data input

to the 580. Two user selectable interface options are avail-

able. 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.

8

O 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.

Rev. 1.22

6

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