XR16C872 Ver la hoja de datos (PDF) - Exar Corporation

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XR16C872

Dual UART with 1284 Parallel Port and Plug-and-Play Controller

Exar Corporation 

XR16C872

Preliminary

RX

INT

IOR#

START

BIT

DATA BITS (5-8)

STOP

BIT

D0 D1

D2 D3 D4 D5 D6 D7

5 DATA BITS

PARITY

BIT

6 DATA BITS

7 DATA BITS

NEXT

DATA

START

BIT

T15D

Active

T16D

16 BAUD RATE CLOCK

Figure 12. Receive Data Timing in DMA Mode 0

XR872RX

RX Data fills RX

FIFO

INT

~4 Characters

Delay

RX FIFO fills to

Trigger Level

Receive Data Time-Out INT

Receive Data Ready INT

IOR#

Unload RX

FIFO Data

XR872RFIFO

Figure 13. Receive Data Timing in FIFO and DMA Mode 1

Rev. P1.00

52

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