ST16C454CJ68 datasheet(4/30 Pages) EXAR

Nome de Peças	ST16C454CJ68

Descrição Electrónicos	QUAD UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)

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Fabricante Electrônico	EXAR [Exar Corporation]

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ST16C454/68C454

4

Rev. 3.20

16/-68

31

I

16/68 Interface Type Select (input with internal pull-up). - This

input provides the 16 (Intel) or 68 (Motorola) bus interface type

select. The functions of -IOR, -IOW, INT A-D, and -CS A-D are re-

assigned with the logical state of this pin. When this pin is a logic

1, the 16 mode interface ST16C454 is selected. When this pin is

a logic 0, the 68 mode interface (ST68C454) is selected. When this

pin is a logic 0, -IOW is re-assigned to R/-W, RESET is re-assigned

to -RESET, -IOR is not used, and INT A-D(s) are connected in a

WIRE-OR configuration. The WIRE-OR outputs are connected

internally to the open source IRQ signal output.

A0

34

I

Address-0 Select Bit. Internal registers address selection in 16 and

68 modes.

A1

33

I

Address-1 Select Bit. Internal registers address selection in 16 and

68 modes.

A2

32

I

Address-2 Select Bit. - Internal registers address selection in 16

and 68 modes.

A3-A4

20,50

I

Address 3-4 Select Bits. - When the 68 mode is selected, these

pins are used to address or select individual UARTs (providing -

CS is a logic 0). In the 16 mode, these pins are reassigned as chip

selects, see -CSB and -CSC.

-CS

16

I

Chip Select. (active low) - In the 68 mode, this pin functions as a

multiple channel chip enable. In this case, all four UARTs (A-D)

are enabled when the -CS pin is a logic 0. An individual UART

channel is selected by the data contents of address bits A3-A4.

When the 16 mode is selected, this pin functions as -CSA, see

definition under -CS A-B.

-CS A-B

16,20

-CS C-D

50,54

I

Chip Select A, B, C, D (active low) - This function is associated with

the 16 mode only, and for individual channels, A through D.

When in 16 Mode, these pins enable data transfers between the

user CPU and the ST16C454 for the channel(s) addressed.

Individual UART sections (A, B, C, D) are addressed by providing

a logic 0 on the respective -CS A-D pin. When the 68 mode is

selected, the functions of these pins are reassigned. 68 mode

functions are described under the their respective name/pin

headings.

Symbol

Signal

Pin Description

type

SYMBOL DESCRIPTION

Nº de peça semelhante - ST16C454CJ68

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Exar Corporation	ST16C454CJ68	177Kb / 29P	QUAD UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)

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Descrição semelhante - ST16C454CJ68

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Exar Corporation	ST16C454	177Kb / 29P	QUAD UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)
Intersil Corporation	IM7332	1Mb / 36P	Universal Asynchronous Receiver Transmitter(UART)
A1 PROs co., Ltd.	EI16C450	1Mb / 1P	Universal Asynchronous Receiver Transmitter(UART) 06/15/99
Exar Corporation	ST16C450	182Kb / 28P	UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)
List of Unclassifed Man...	COM8017	553Kb / 8P	UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER UART
NXP Semiconductors	SCC2691	168Kb / 24P	Universal asynchronous receiver/transmitter UART 1998 Sep 04
IMP, Inc	IMP16C554	510Kb / 20P	Quad Universal Asynchronous Receiver/Transmitter (UART) with FIFOs
Intersil Corporation	CDP1854A	95Kb / 21P	Programmable Universal Asynchronous Receiver/Transmitter (UART) March 1997
Intersil Corporation	HD-6402	154Kb / 7P	CMOS Universal Asynchronous Receiver Transmitter (UART)
Harris Corporation	HD6402	100Kb / 6P	CMOS Universal Asynchronous Receiver Transmitter (UART)

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