ST16C554D datasheet(32/39 Pages) EXAR

Part #	ST16C554D

Description	2.97V TO 5.5V QUAD UART WITH 16-BYTE FIFO

PDF	39 Pages

Scroll/Zoom	100%

Manufacturer	EXAR [Exar Corporation]

Direct Link	http://www.exar.com

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32 / 39 page

ST16C554/554D

2.97V TO 5.5V QUAD UART WITH 16-BYTE FIFO

REV. 4.0.1

FIGURE 18. TRANSMIT READY & INTERRUPT TIMING [NON-FIFO MODE] FOR CHANNELS A-D

FIGURE 19. RECEIVE READY & INTERRUPT TIMING [FIFO MODE, DMA DISABLED] FOR CHANNELS A-D

TXRDY#

IOW#

INT*

D0:D7

Start

Bit

D0:D7

Stop

Bit

D0:D7

TXNonFIFO

WRI

SRT

*INT is cleared when the ISR is read or when data is loaded into the THR.

ISR is read

(Loading data

into THR)

(Unloading)

IER[1]

enabled

RXRDY#

IOR#

INT

D0:D7

SSR

RXINTDMA#

RX FIFO fills up to RX

Trigger Level or RX Data

Timeout

RX FIFO drops

below RX

Trigger Level

FIFO

Empties

First Byte is

Received in

RX FIFO

D0:D7

Start

Bit

Stop

Bit

RRI

SSI

(Reading data out

of RX FIFO)

ST16C554D Datasheet(PDF) 32 Page - Exar Corporation

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