xr16l2751im Exar Corporation, xr16l2751im Datasheet - Page 51

• Manufacturer Part Number: xr16l2751im
• Description: 2.25v To 5.5v Duart With 64-byte Fifo And Powersave
• Manufacturer: Exar Corporation

xr
GENERAL DESCRIPTION................................................................................................. 1
PIN DESCRIPTIONS ......................................................................................................... 3
1.0 PRODUCT DESCRIPTION ....................................................................................................... 6
2.0 FUNCTIONAL DESCRIPTIONS ............................................................................................... 8
3.0 UART INTERNAL REGISTERS ............................................................................................. 22
REV. 1.2.2
F
F
F
T
T
T
T
T
F
F
F
T
F
F
F
F
F
T
F
F
T
T
IGURE
IGURE
IGURE
ABLE
ABLE
ABLE
ABLE
ABLE
IGURE
IGURE
IGURE
ABLE
IGURE
IGURE
IGURE
IGURE
IGURE
ABLE
IGURE
IGURE
ABLE
ABLE
A
F
ORDERING INFORMATION
2.1 CPU I
2.2 5-V
2.3 D
2.4 D
2.5 C
2.6 C
2.7 DMA M
2.8 INTA
2.9 C
2.10 P
2.11 T
2.12 RECEIVER .................................................................................................................................... 14
2.13 A
2.14 A
2.15 A
2.16 A
2.17 S
2.18 A
2.19 I
2.20 S
2.21 I
EATURES
PPLICATIONS
1: C
2: C
3: TXRDY#
4: INTA
5: INTA
6: T
7: A
8: UART CHANNEL A AND B UART INTERNAL REGISTERS .............................................................................................. 22
9: INTERNAL REGISTERS DESCRIPTION. S
2.11.1 Transmit Holding Register (THR) - Write Only ....................................................................................... 13
2.11.2 Transmitter Operation in non-FIFO Mode .............................................................................................. 13
2.11.3 Transmitter Operation in FIFO Mode ..................................................................................................... 13
2.12.1 Receive Holding Register (RHR) - Read-Only ....................................................................................... 14
2.20.1 Sleep Mode ............................................................................................................................................ 20
2.20.2 PowerSave Feature ............................................................................................................................... 20
1. XR16L2751 B
2. P
3. XR16L2751 T
4. T
5. E
6. B
7. T
8. T
9. R
10. R
11. A
12. I
13. I
EVICE
EVICE
HANNEL
HANNEL
RYSTAL
NFRARED
NTERNAL
RANSMITTER
YPICAL DATA RATES WITH A
UTO
HANNEL
HANNEL
ROGRAMMABLE
UTO
UTO
UTO
UTO
PECIAL
UTO
LEEP
OLT
YPICAL OSCILLATOR CONNECTIONS
RANSMITTER
RANSMITTER
IN
XTERNAL
AUD
ECEIVER
NFRARED
NTERNAL
UTO
ECEIVER
AND
O
NTERFACE
AND
AND
.................................................................................................................................................. 1
X
UT
ODE
R
T
H
I
RTS (H
RTS H
CTS F
X
ON
RS485 H
DENTIFICATION AND
RTS
M
ATE
OLERANT
ARDWARE
O
ON
AND
A
A
A
A
............................................................................................................................................. 1
A
INTB P
INTB P
/X
INTB O
C
ODE WITH
SSIGNMENT
SCILLATOR OR
O
C
AND
AND
L
L
AND
AND
OFF
M
T
O
/X
HARACTER
G
...................................................................................................................................... 10
PERATION IN NON
LOCK
OOP
AND
OOPBACK
RANSMIT
RXRDY# O
PERATION IN
ENERATOR AND
ODE
O
O
LOCK
YPICAL
OFF
LOW
YSTERESIS
B S
B S
(S
PERATION IN NON
PERATION IN
ARDWARE
................................................................................................................................. 13
INS
IN
B S
B I
CTS F
B
................................................................................................................................. 8
C
OFTWARE
ALF
ACK IN
ELECT IN
ELECT IN
UTPUTS
O
I
ONNECTION FOR
B
(S
D
............................................................................................................................ 19
NPUTS
O
NTERNAL
C
R
PERATION
............................................................................................................................................................. 2
I
IAGRAM
ELECTION
AUD
............................................................................................................................. 2
D
NTEL
PERATION FOR
-
W
ONTROL
OFTWARE
ESET
DUPLEX
ATA
LOW
UTPUTS IN
AKE
D
C
..................................................................................................................... 21
FIFO
/M
14.7456 MH
) F
R
ETECT
HANNEL
) F
E
16 M
68 M
E
FIFO
C
-FIFO M
................................................................................................................. 16
................................................................................................................................................. 1
P
OTOROLA
NCODING AND
ATE
-U
.................................................................................................................. 9
................................................................................................................ 10
LOW
XTERNAL
ONTROL
................................................................................................................. 9
RESCALER
F
R
LOW
AND
R
OR
-FIFO M
P
EVISION
ODE
ODE
C
........................................................................................................... 16
EGISTERS
AND
) F
............................................................................................................ 9
TABLE OF CONTENTS
G
...................................................................................................................................... 11
C
I
FIFO
ONTROL
A
NDICATOR AND
R
E
........................................................................................................ 18
A
ONTROL
T
ENERATOR
ODE
C
.................................................................................................................................... 9
.................................................................................................................................... 9
ECEIVER
XTENDED
AND
LOW
UTO
RANSMITTER
O
F
D
ONTROL
Z CRYSTAL OR EXTERNAL CLOCK
LOW
PERATION
ATA
2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
ODE
AND
............................................................................................................................ 12
C
........................................................................................................................... 15
B........................................................................................................................ 21
RTS F
R
LOCK
C
................................................................................................ 9
HADED BITS ARE ENABLED WHEN
....................................................................................................................... 18
B
ECEIVE
C
...................................................................................................................... 13
..................................................................................................................... 10
DMA M
ONTROL
US
........................................................................................... 19
ONTROL
D
............................................................................................ 9
ATA
LOW
I
NTERCONNECTIONS
.............................................................................................................. 10
.............................................................................................................. 17
...................................................................................... 12
...................................................................................... 16
I
NPUT
D
R
ODE
ATA
C
P
ATE
M
ONTROL
I
OWER
ODE
.............................................................................. 18
.................................................................................................. 10
D
................................................................................................. 11
........................................................................... 11
ECODING
............................................................................................. 14
S
M
AVE
ODE
................................................................................. 19
.................................................................................. 8
............................................................................... 15
.............................................................................. 12
F
EATURE
EFR B
IT
............................................. 20
-4=1 ................................................. 23
XR16L2751