XR16C850CQ datasheet(5/55 Pages) EXAR

Part #	XR16C850CQ

Description	UART with 128-byte FIFO?셲 FIFO Counters and Half-duplex Control

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Manufacturer	EXAR [Exar Corporation]

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XR16C850

5

Rev. 1.20

A0

28

31

28

31

I

Address-0 Select Bit - Internal registers address

selection in PC and STD modes.

A1

27

30

27

30

I

Address-1 Select Bit Internal registers address

selection in PC and STD modes

A2

26

29

26

29

I

Address-2 Select Bit Internal registers address

selection in PC and STD modes

A3 / IOR

22

25

20

22

I

Address-3 Select Bit or Input/Output Read (dual

function) - When the PC mode is selected, this pin

is used as 4th address line to decode the COM1-4

and LPT ports. During STD mode operation this pin

is used as Read strobe. Its function is the same as

-IOR (see -IOR), except it is active high. Either an

active -IOR or IOR is required to transfer data from

850 to CPU during a read operation. Connect this

pin to GND when –IOR is used.

A4

-

12

6

I

Address-4 Select Bit (internal pull-up) - When the

PC mode is selected, this pin is used as 5th address

line to decode the COM1-4 and LPT ports. This pin

has no function in the STD mode.

A5 / CS0

12

14

9

I

Address-5 Select Bit or Chip Select-0 (dual function)

- When the PC mode is selected, this pin is used as

6th address line to decode the COM1-4 and LPT

ports. During STD mode a logical 1 on this pin

provides the chip select 0 function. Connect this pin

to VCC when CS1 or –CS2 is used.

A6 / CS1

13

15

10

I

Address-6 Select Bit or Chip Select-1 (dual function)

- When the PC mode is selected, this pin is used as

7th address line to decode the COM1-4 and LPT

ports. During STD mode a logical 1 on this pin

provides the chip select 1 function. Connect this pin

to VCC when CS0 or –CS2 is used.

A7 / -CS2

14

16

11

7

I

Address-7 Select Bit or Chip Select -2 (dual func-

tion) - When the PC mode is selected, this pin is

used as 8th address line to decode the COM1-4 and

LPT ports. During STD mode a logical 1 on this pin

provides the chip select 2 function. Connect this pin

Symbol

Signal

Pin Description

40

44

48

52

type

SYMBOL DESCRIPTION

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