XR16C850 Ver la hoja de datos (PDF) - Exar Corporation

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XR16C850

UART with 128-byte FIFO’s FIFO Counters and Half-duplex Control

Exar Corporation 

XR16C850

SYMBOL DESCRIPTION

Symbol

-DSR

-DTR

-RI

-RTS

RX / IRRX

Pin

Signal

40 44 48 52 type

Pin Description

reading MSR bit-4. This pin only affects the transmit

and receive operations when Auto CTS function is

enabled via the Enhanced Feature Register (EFR)

bit-7, for hardware flow control operation.

37 41 39 42

I

Data Set Ready (active low) - A logic 0 on this pin

indicates the modem or data set is powered-on and

is ready for data exchange with the UART. This pin

has no effect on the UART’s transmit or receive

operation.

33

37

33

36

O Data Terminal Ready (active low) - A logic 0 on this

pin indicates that the 850 is powered-on and ready.

This pin can be controlled via the modem control

register. Writing a logic 1 to MCR bit-0 will set the -

DTR output to logic 0, enabling the modem. This pin

will be a logic 1 after writing a logic 0 to MCR bit-0,

or after a reset. This pin has no effect on the UART’s

transmit or receive operation.

39 43

41 44

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

36

32

35

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

function is enabled via the Enhanced Feature Reg-

ister (EFR) bit-6, for hardware flow control operation.

10 11

7

7

I

Receive Data - This pin provides the serial receive

data input to the 850. Two user selectable interface

options are available. The first option supports the

standard serial interface. The second option pro-

vides an Infrared decoder interface, see figures 2 and

3. When using the standard modem interface, the

RX input must be a logic 1 during idle (no data

Rev. 1.20

11

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