XR68C192IJ datasheet(4/32 Pages) EXAR

Part #	XR68C192IJ

Description	DUAL UNIVERSAL ASYNCHRONOUS RECEIVER AND TRANSMITTER

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Manufacturer	EXAR [Exar Corporation]

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XR68C92/192

4

Rev. P1.10

SYMBOL DESCRIPTION (* 44 TQFP Package)

Symbol

Signal

Pin Description

44

40

44*

type

-DTACK

10

9

4

O

Data transfer acknowledge (three-state active low output).

During Read, Write, or interrupt cycle goes low to indicate

proper transfer of data between the CPU and XR68C92/

192.

RX A/B

35,11

31,10

29,5

I

Serial data input. The serial information (data) received

from serial port to XR68C92/192 receive input circuit. A

mark (high) is logic one and a space (low) is logic zero.

TX A/B

33,13

30,11

28,6

O

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

with additional start , stop and parity bits. The TX will be held

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

when the transmitter is disabled.

OP0

32

29

27

O

Multi-purpose output. General purpose output or Channel A

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

OP1

14

12

7

O

Multi-purpose output. General purpose output or Channel B

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

OP2

31

28

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 Configuration Register bits 1,0:

TxAClk1 -Transmit 1X clock.

TxAClk16 -Transmit 16X clock

RxAClk1 -Receive 1X clock

OP3

15

13

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 Configuration Register bits 3,2:

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

TxBClk1 -Transmit 1X clock

RxBClk1 -Receive 1X clock

OP4

30

27

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 Configuration Register bit 4:

-RxARDY -Receive ready signal (Open drain output)

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

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