xr16v2751im Exar Corporation, xr16v2751im Datasheet - Page 51

• Manufacturer Part Number: xr16v2751im
• Description: High Performance Duart With 64-byte Fifo And Powersave Feature
• Manufacturer: Exar Corporation

REV. 1.0.1
GENERAL DESCRIPTION................................................................................................ 1
PIN DESCRIPTIONS ........................................................................................................ 3
1.0 PRODUCT DESCRIPTION ...................................................................................................................... 7
2.0 FUNCTIONAL DESCRIPTIONS .............................................................................................................. 8
3.0 UART INTERNAL REGISTERS............................................................................................................. 22
4.0 INTERNAL REGISTER DESCRIPTIONS .............................................................................................. 24
A
F
O
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 .............................................................................................................................. 16
2.15 AUTO CTS FLOW CONTROL........................................................................................................................ 17
2.16 AUTO XON/XOFF (SOFTWARE) FLOW CONTROL...................................................................................... 18
2.17 SPECIAL CHARACTER DETECT.................................................................................................................. 18
2.18 AUTO RS485 HALF-DUPLEX CONTROL ..................................................................................................... 18
2.19 INFRARED MODE ........................................................................................................................................... 19
2.20 SLEEP MODE WITH WAKE-UP INDICATOR AND POWERSAVE FEATURE ............................................ 20
2.21 INTERNAL LOOPBACK................................................................................................................................. 21
4.1 RECEIVE HOLDING REGISTER (RHR) - READ- ONLY .................................................................................. 24
4.2 TRANSMIT HOLDING REGISTER (THR) - WRITE-ONLY ............................................................................... 24
RDERING
F
F
F
T
T
T
T
T
F
F
T
F
F
F
F
F
T
F
F
T
T
IGURE
IGURE
IGURE
ABLE
ABLE
ABLE
ABLE
ABLE
IGURE
IGURE
ABLE
IGURE
IGURE
IGURE
IGURE
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
2.20.1 SLEEP MODE ............................................................................................................................................................. 20
2.20.2 POWERSAVE FEATURE............................................................................................................................................ 20
1: C
2: C
3: TXRDY#
4: INTA
5: INTA
6: T
7: A
8: UART I
9: I
1. XR16V2751 B
2. P
3. XR16V2751 T
4. T
5. B
6. T
7. T
8. R
9. R
10. A
11. I
12. I
.................................................................................................................................................... 1
I
NFORMATION
YPICAL DATA RATES WITH A
HANNEL
HANNEL
UTO
NTERNAL
YPICAL OSCILLATOR CONNECTIONS
RANSMITTER
RANSMITTER
IN
AUD
ECEIVER
ECEIVER
NFRARED
NTERNAL
UTO
.............................................................................................................................................. 1
O
AND
AND
X
UT
R
ON
NTERNAL
RTS
ATE
A
A
AND
A
INTB P
INTB P
/X
R
SSIGNMENT
O
O
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO AND POWERSAVE FEATURE
AND
AND
L
OFF
T
EGISTERS
G
PERATION IN NON
PERATION IN
OOPBACK IN
AND
RANSMIT
RXRDY# O
ENERATOR
O
O
YPICAL
LOCK
B S
B S
PERATION IN NON
PERATION IN
(S
.............................................................................................................................. 2
R
INS
IN
CTS F
EGISTERS
OFTWARE
ELECT IN
ELECT IN
O
D
O
PERATION
..................................................................................................................................................... 2
I
D
IAGRAM
D
PERATION FOR
NTEL
ESCRIPTION
ATA
LOW
............................................................................................................................................... 12
FIFO
C
UTPUTS IN
HANNEL
/M
24 MH
) F
E
16 M
68 M
.......................................................................................................................................... 22
FIFO
C
-FIFO M
NCODING AND
......................................................................................................................................... 1
OTOROLA
LOW
ONTROL
TABLE OF CONTENTS
AND
F
OR
-FIFO M
ODE
ODE
Z CRYSTAL OR EXTERNAL CLOCK AT
AND
............................................................................................................................... 11
A
. S
C
A
FIFO
R
UTO
ONTROL
AND
T
ODE
HADED BITS ARE ENABLED WHEN
ECEIVER
RANSMITTER
............................................................................................................................ 9
............................................................................................................................ 9
O
F
D
LOW
PERATION
ATA
ODE
B.................................................................................................................. 21
AND
RTS F
.................................................................................................................... 15
R
ECEIVE
B
C
.............................................................................................................. 14
............................................................................................................... 18
DMA M
US
ONTROL
............................................................................................................. 10
LOW
I
....................................................................................................... 17
NTERCONNECTIONS
...................................................................................................... 10
I
D
C
ODE
ATA
ONTROL
M
ODE
D
........................................................................................... 10
ECODING
..................................................................................... 14
M
ODE
16X S
.......................................................................... 19
........................................................................... 8
......................................................................... 16
EFR B
AMPLING
IT
-4=1 .................................................... 23
................................................... 13
XR16V2751