XR88C92IV datasheet(4/32 Pages) EXAR

Part #	XR88C92IV

Description	DUAL UNIVERSAL ASYNCHRONOUS RECEIVER AND TRANSMITTER

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Manufacturer	EXAR [Exar Corporation]

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XR88C92/192

4

Rev. 1.33

SYMBOL DESCRIPTION (* 44 pin LQFP)

RXA,RXB

35,11

29,5

I

Serial data input. The serial information (data) received from

serial port to XR88C92/192 receive input circuit. A mark (high)

is logic one and a space (low) is logic zero.This input must

be held at logic one when idle and during power down.

TXA,TXB

33,13

28,6

O

Serial data output. The serial data is transmitted via this pin

with additional start , stop and parity bits. This output will be

held in mark (high) state during reset, local loop back mode

or when the transmitter is disabled.

RESET

38

32

I

Master Reset (active high). A high on this pin will reset all the

outputs and internal registers. The transmitter output and

the receiver input will be disabled during reset time.

OP0

32

27

O

Multi-purpose output. General purpose output or Channel A

Request-To-Send (-RTSA active low).

OP1

14

7

O

Multi-purpose output. General purpose output or Channel B

Request-To-Send (-RTSB active low).

OP2

31

26

O

Multi-purpose output. General purpose output or one of the

following functions can be selected for this output pin by

programming the Output Port Confiuration Register bits 1,0;

TxAClk1 -Transmit 1X clock.

TxAClk16 -Transmit 16X clock

RxAClk1 -Receive 1X clock

OP3

15

8

O

Multi-purpose output. General purpose output or one of the

following functions can be selected for this output pin by

programming the Output Port Confiuration Register bits 3,2;

C/T -Counter timer output (Open drain output)

TxBClk1 -Transmit 1X clock

RxBClk1 -Receive 1X clock

OP4

30

25

O

Multi-purpose output. General purpose output or one of the

following functions can be selected for this output pin by

programming the Output Port Confiuration Register bit 4;

-RxARDY -Receive ready signal (Open drain output)

-RxAFULL - Receive FIFO full signal (Open drain output)

Symbol

Signal

Pin Description

44

44*

type

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