xr16l784iv Exar Corporation, xr16l784iv Datasheet - Page 50

• Manufacturer Part Number: xr16l784iv
• Description: High Performance 2.97v To 5.5v Quad Uart
• Manufacturer: Exar Corporation

XR16L784
HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
GENERAL DESCRIPTION ............................................................................................... 1
PIN DESCRIPTIONS ....................................................................................................... 3
1.0 DESCRIPTION ........................................................................................................................................ 6
2.0 Functional Descriptions ........................................................................................................................ 6
2.1 D
2.2 UART C
2.3 S
2.4 INT# O
2.5 CRYSTAL OSCILLATOR / BUFFER .......................................................................................................................... 7
2.6 P
2.7 T
2.8 R
2.9 THR
2.10 A
2.11 A
2.12 S
2.13 A
2.14 I
2.15 S
2.16 I
3.0 XR16L784 REGISTERS ........................................................................................................................ 19
3.1
DEVICE CONFIGURATION REGISTER SET ........................................................................................ 19
A
F
Figure 1. Block Diagram ....................................................................................................................... 1
Figure 2. Pin Out Assignment .............................................................................................................. 2
ORDERING INFORMATION
T
T
T
Figure 3. Typical oscillator connections ............................................................................................. 7
Figure 4. External Clock Connection for Extended Data Rate .......................................................... 8
Figure 5. Baud Rate Generator ............................................................................................................. 8
T
Figure 6. Transmitter Operation in non-FIFO Mode ......................................................................... 10
Figure 7. Transmitter Operation in FIFO and Flow Control Mode ................................................... 10
Figure 8. Receiver Operation in non-FIFO Mode .............................................................................. 11
Figure 9. Receiver Operation in FIFO and Auto RTS Flow Control Mode ...................................... 11
T
Figure 10. Auto RTS/DTR and CTS/DSR Flow Control Operation ................................................... 13
T
Figure 11. Infrared Transmit Data Encoding and Receive Data Decoding ..................................... 16
Figure 12. Internal Loop Back ............................................................................................................ 18
Figure 13. The XR16L784 Registers Mapping ................................................................................... 19
T
T
RANSMITTER
IMULTANEOUS
ROGRAMMABLE
EVICE
ECEIVER
NFRARED
NTERNAL
PPLICATIONS
EATURES
ABLE
ABLE
ABLE
ABLE
ABLE
ABLE
ABLE
ABLE
UTOMATIC
UTO
PECIAL
UTO
LEEP
2.1.1 Hardware Reset ....................................................................................................................... 6
2.1.2 Software Reset ......................................................................................................................... 6
2.7.1 Transmit Holding Register (THR) - Write Only ......................................................................... 9
2.7.2 Transmitter Operation in non-FIFO Mode ................................................................................ 9
2.7.3 Transmitter Operation in FIFO Mode ..................................................................................... 10
2.8.1 Receive Holding Register (RHR) - Read-Only ....................................................................... 11
AND
2.10.1 Auto CTS/DSR Flow Control ................................................................................................ 13
3.1.1 The Global Interrupt Source Registers ................................................................................... 21
UPUT
X
R
RS485 H
HANNEL
1: UART C
2: INT# P
3: INT# P
4: T
5: T
6: A
7: XR16L784 R
8: D
M
ON
ESET
RHR R
................................................................................................................................................................... 10
C
ODE WITH
L
M
/X
HARACTER
OOPBACK
................................................................................................................................................. 1
YPICAL DATA RATES WITH A
RANSMIT AND
RTS/DTR H
UTO
ODE
EVICE
................................................................................................................................................................ 7
OFF
............................................................................................................................................................... 9
.............................................................................................................................................................. 6
W
S
B
........................................................................................................................................... 1
EGISTER
ALF
RITE TO
(S
ELECTION
AUD
....................................................................................................................................................... 15
X
IN
IN
ON
C
OFTWARE
-
W
HANNEL
DUPLEX
ONFIGURATION
O
O
................................................................................................................................................ 18
R
AKE
D
/X
PERATION FOR
PERATION
ATE
ETECT
ARDWARE
A
OFF
L
EGISTER
-U
LL
OCATIONS
............................................................................................................................ 2
R
......................................................................................................................................... 6
G
P
C
) F
C
ECEIVE
S
ENERATOR
(S
I
ONTROL
NDICATOR
HANNELS
.................................................................................................................................. 14
ELECTION
LOW
OFTWARE
F
F
S
LOW
OR
C
ETS
........................................................................................................................ 12
D
R
TABLE OF CONTENTS
ONTROL
..................................................................................................................... 15
ATA
EGISTERS
T
R
..................................................................................................................... 6
C
.................................................................................................................... 8
.................................................................................................................. 17
RANSMITTER
ECEIVER
..................................................................................................... 19
ONTROL
) F
...................................................................................................... 6
14.7456 MH
R
LOW
EGISTER
......................................................................................................... 14
O
C
........................................................................................ 20
......................................................................................... 7
PERATION
ONTROL
, 16C550
................................................................................... 7
Z CRYSTAL OR EXTERNAL CLOCK AT
I
........................................................................ 14
................................................................................ 12
COMPATIBLE
.............................................. 12
16X S
xr
AMPLING
REV. 1.2.2
... 9