XR68C192CP datasheet(5/32 Pages) EXAR

Part #	XR68C192CP

Description	DUAL UNIVERSAL ASYNCHRONOUS RECEIVER AND TRANSMITTER

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Manufacturer	EXAR [Exar Corporation]

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XR68C92/192

5

Rev. P1.10

SYMBOL DESCRIPTION (* 44 TQFP Package)

Symbol

Signal

Pin Description

44

40

44*

type

OP5

16

14

9

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 5:

-RxBRDY - Receive ready signal (Open drain output)

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

OP6

29

26

24

O

Multi-purpose output. General purpose output or Transmit

A holding register empty interrupt (-TxARDY Open drain

output).

OP7

17

15

10

O

Multi-purpose output. General purpose output or Transmit

B holding register empty interrupt (-TxBRDY Open drain

output).

A1-A4

2,4,

1,3,

40,42,

6,7

5,6

44,1

I

Address select lines. To select internal registers.

XTAL1

36

32

30

I

Crystal input 1 or external clock input. A crystal can be

connected to this pin and XTAL2 pin to utilize the internal

oscillator circuit. An external clock can be used to clock

internal circuit and baud rate generator for custom transmis-

sion rates.

XTAL2

37

33

31

O

Crystal input 2 or buffered clock output. See XTAL1.

-RESET

38

34

32

I

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

outputs and internal registers. The transmitter output and

the receiver input will be disabled during reset time.

GND

22

20

16,17

Pwr

Signal and power ground.

-INT

24

21

18

O

Interrupt output (open drain active low) This pin goes low upon

occurrence of one or more of eight maskable interrupt condi-

tions (when enabled by the interrupt mask register) . CPU can

read the interrupt status register to determine the interrupting

condition(s). This output requires a pull-up resistor.

IP0

8

7

2

I

Multi-purpose input or Channel A Clear-To-Send (-CTSA

active low).

IP1

5

4

43

I

Multi-purpose input or Channel B Clear-To-Send (-CTSB

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