xr16v2551im Exar Corporation, xr16v2551im Datasheet - Page 50

• Manufacturer Part Number: xr16v2551im
• Description: High Performance Duart With 16-byte Fifo And Powersave Feature
• Manufacturer: Exar Corporation

XR16V2551
HIGH PERFORMANCE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
GENERAL DESCRIPTION ................................................................................................ 1
PIN DESCRIPTIONS ........................................................................................................ 3
1.0 PRODUCT DESCRIPTION....................................................................................................................... 7
2.0 FUNCTIONAL DESCRIPTIONS............................................................................................................... 8
3.0 UART INTERNAL REGISTERS ............................................................................................................. 23
4.0 INTERNAL REGISTER DESCRIPTIONS............................................................................................... 25
A
F
ORDERING INFORMATION
EATURES
PPLICATIONS
2.1 CPU INTERFACE................................................................................................................................................. 8
2.2 5-VOLT TOLERANT INPUTS .............................................................................................................................. 8
2.3 DEVICE RESET ................................................................................................................................................... 9
2.4 DEVICE IDENTIFICATION AND REVISION........................................................................................................ 9
2.5 CHANNEL A AND B SELECTION....................................................................................................................... 9
2.6 CHANNEL A AND B INTERNAL REGISTERS ................................................................................................... 9
2.7 DMA MODE........................................................................................................................................................ 10
2.8 INTA AND INTB OUTPUTS ............................................................................................................................... 10
2.9 CRYSTAL OSCILLATOR OR EXTERNAL CLOCK INPUT .............................................................................. 11
2.10 PROGRAMMABLE BAUD RATE GENERATOR WITH FRACTIONAL DIVISOR.......................................... 11
2.11 TRANSMITTER ................................................................................................................................................ 13
2.12 RECEIVER ....................................................................................................................................................... 15
2.13 AUTO RTS (HARDWARE) FLOW CONTROL ................................................................................................ 16
2.14 AUTO RTS HYSTERESIS............................................................................................................................... 17
2.15 AUTO CTS FLOW CONTROL ........................................................................................................................ 17
2.16 AUTO XON/XOFF (SOFTWARE) FLOW CONTROL...................................................................................... 19
2.17 SPECIAL CHARACTER DETECT .................................................................................................................. 19
2.18 INFRARED MODE ........................................................................................................................................... 20
2.19 SLEEP MODE WITH WAKE-UP INDICATOR AND POWERSAVE FEATURE............................................. 20
2.20 INTERNAL LOOPBACK ................................................................................................................................. 22
4.1 RECEIVE HOLDING REGISTER (RHR) - READ- ONLY .................................................................................. 25
4.2 TRANSMIT HOLDING REGISTER (THR) - WRITE-ONLY ............................................................................... 25
F
F
F
T
T
T
T
T
F
F
T
F
F
F
F
T
F
T
F
F
T
T
IGURE
IGURE
IGURE
ABLE
ABLE
ABLE
ABLE
ABLE
IGURE
IGURE
ABLE
IGURE
IGURE
IGURE
IGURE
ABLE
IGURE
ABLE
IGURE
IGURE
ABLE
ABLE
2.11.1 TRANSMIT HOLDING REGISTER (THR) - WRITE ONLY ......................................................................................... 14
2.11.2 TRANSMITTER OPERATION IN NON-FIFO MODE .................................................................................................. 14
2.11.3 TRANSMITTER OPERATION IN FIFO MODE ........................................................................................................... 14
2.12.1 RECEIVE HOLDING REGISTER (RHR) - READ-ONLY ............................................................................................ 15
2.19.1 SLEEP MODE ............................................................................................................................................................. 21
2.19.2 POWERSAVE FEATURE............................................................................................................................................ 21
1: C
2: C
3: TXRDY#
4: INTA
5: INTA
6: T
7: A
8: A
9: UART CHANNEL A AND B UART INTERNAL REGISTERS ....................................................................................... 23
10: INTERNAL REGISTERS DESCRIPTION. S
1. XR16V2551 B
2. P
3. XR16V2551 T
4. T
5. B
6. T
7. T
8. R
9. R
10. A
11. I
12. I
.................................................................................................................................................... 1
YPICAL DATA RATES WITH A
UTO
UTO
HANNEL
HANNEL
YPICAL
RANSMITTER
RANSMITTER
IN
AUD
ECEIVER
ECEIVER
NFRARED
NTERNAL
............................................................................................................................................... 1
UTO
O
AND
AND
RTS (H
X
UT
R
ON
RTS
ATE
AND
C
A
A
A
INTB P
INTB P
/X
RYSTAL CONNECTIONS
O
O
SSIGNMENT
AND
AND
L
OFF
T
G
PERATION IN NON
PERATION IN
OOP
ARDWARE
AND
RANSMIT
RXRDY# O
ENERATOR
O
O
YPICAL
LOCK
................................................................................................................................ 2
B S
B S
PERATION IN NON
PERATION IN
(S
INS
IN
CTS F
B
OFTWARE
ACK IN
ELECT IN
ELECT IN
O
D
O
PERATION
I
IAGRAM
..................................................................................................................................................... 2
D
) F
NTEL
PERATION FOR
ATA
LOW
............................................................................................................................................... 12
FIFO
UTPUTS IN
LOW
C
/M
24 MH
) F
HANNEL
E
16 M
68 M
FIFO
C
-FIFO M
NCODING AND
......................................................................................................................................... 1
OTOROLA
C
LOW
ONTROL
AND
TABLE OF CONTENTS
F
ONTROL
................................................................................................................................... 11
OR
-FIFO M
ODE
ODE
Z CRYSTAL OR EXTERNAL CLOCK AT
AND
C
A
FIFO
A
R
ONTROL
UTO
T
ODE
ECEIVER
AND
RANSMITTER
............................................................................................................................ 9
............................................................................................................................ 9
O
F
D
........................................................................................................................ 17
LOW
PERATION
ATA
ODE
RTS F
AND
.................................................................................................................... 15
B ................................................................................................................ 22
R
ECEIVE
B
C
.............................................................................................................. 14
............................................................................................................... 19
DMA M
HADED BITS ARE ENABLED WHEN
US
ONTROL
............................................................................................................. 10
LOW
I
....................................................................................................... 18
NTERCONNECTIONS
...................................................................................................... 10
I
D
C
ODE
ATA
ONTROL
M
ODE
D
........................................................................................... 10
ECODING
..................................................................................... 14
M
ODE
16X S
.......................................................................... 20
........................................................................... 8
......................................................................... 16
AMPLING
EFR B
................................................... 13
IT
-4=1 ....................................... 24
REV. 1.0.2