XR16L784 Exar Corporation, XR16L784 Datasheet - Page 43

• Manufacturer Part Number: XR16L784
• Description: High Performance 5V And 3.3V Quad Uart
• Manufacturer: Exar Corporation

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PRELIMINARY
4.7 R
4.8 R
4.9 IER
4.10 IER
4.11 I
ABSOLUTE MAXIMUM RATINGS ................................................................................ 33
ELECTRICAL CHARACTERIISTICS ............................................................................. 33
PACKAGE DIMENSIONS, 64-TQFP ............................................................................. 39
TABLE OF CONTENTS .................................................................................................... I
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Figure 12. Transmiitter Operation in FIFO and Flow Control Mode ............................................... 21
Figure 13. Receiver Operation in non-FIFO Mode ............................................................................ 22
Figure 14. Receiver Operation in FIFO and Flow Control Mode ..................................................... 22
T
T
T
T
T
T
EFR[6]: A
T
DC ELECTRICAL CHARACTERISTICS ............................................................................................... 33
AC ELECTRICAL CHARACTERISTICS ............................................................................................... 34
Figure 15. 16 Mode (Intel) Data Bus Read and Write Timing .......................................................... 35
Figure 16. 68 Mode (Motorola) Data Bus Read and Write Timing ................................................... 36
Figure 17. Modem Input/Output Port Delay ...................................................................................... 37
Figure 18. Transmit Data Interrupt at Trigger Level ......................................................................... 37
Figure 19. Receive Data Ready Interrupt at Trigger Level .............................................................. 38
R
ECEIVER
EGISTERS
NTERRUPT
ABLE
ABLE
ABLE
ABLE
ABLE
ABLE
ABLE
EVISION
VERSUS
4.6.4 Auto RS485 Operation .......................................................................................................... 20
4.8.1 Receive Holding Register (RHR) ........................................................................................... 21
4.8.2 Baud Rate Generator Divisors (DLL and DLM) ..................................................................... 21
4.8.3 Interrupt Enable Register (IER) ............................................................................................. 22
4.11.1 Interrupt Generation: ........................................................................................................... 23
4.11.2 Interrupt Clearing: ................................................................................................................ 24
4.11.3 FIFO Control Register (FCR) ............................................................................................... 24
4.11.4 Line Control Register (LCR) ................................................................................................ 25
4.11.5 Modem Control Register (MCR) or General Purpose Outputs Control. .............................. 26
4.11.6 Line Status Register (LSR) .................................................................................................. 27
4.11.7 Modem Status Register (MSR) - Read Only ....................................................................... 28
4.11.8 Modem Status Register (MSR) - Write Only ........................................................................ 28
4.11.9 SCRATCH PAD REGISTER (SPR) ..................................................................................... 29
4.11.10 FEATURE CONTROL REGISTER (FCTR) ....................................................................... 29
4.11.11 Enhanced Feature Register (EFR) .................................................................................... 30
4.11.12 TFCNT[7:0] : Transmit FIFO Level Counter, read-only ..................................................... 32
4.11.13 TXTRG [7:0]: Transmit FIFO Trigger Level, write only. ..................................................... 32
4.11.14 RFCNT[7:0]: Receive FIFO Level Counter, read only ....................................................... 32
4.11.15 RXTRG[7:0]: Receive FIFO Trigger Level, write only ........................................................ 32
VERSUS
9: I
10: T
11: P
12: A
13: 16 S
14: S
15: UART RESET CONDITIONS .............................................................................................. 32
.................................................................................................................................................................. 21
................................................................................................................................................................. 21
H
UTO
NTERRUPT
S
R
ISTORY
R
TATUS
ECEIVE
RANSMIT AND
ARITY SELECTION
OFTWARE
UTO
ECEIVE
RTS
ELECTABLE
RS485 H
R
FIFO I
.................................................................................................................................. 40
/T
EGISTER
OR
S
RANSMIT
F
OURCE AND
DTR F
LOW
NTERRUPT
R
ALF
(ISR) ......................................................................................................................... 23
H
ECEIVE
C
YSTERESIS
FIFO P
LOW
-
................................................................................................................ 26
ONTROL
DUPLEX
M
P
C
FIFO T
OLLED
ODE
RIORITY
ONTROL
F
D
L
O
UNCTIONS
IRECTION
EVELS
PERATION
M
RIGGER
ODE
L
E
EVEL
NABLE
O
W
PERATION
C
L
HEN
................................................................................ 31
......................................................................................... 22
II
............................................................................... 24
EVEL
ONTROL
............................................................................ 31
HIGH PERFORMANCE 5V AND 3.3V QUAD UART
T
RIGGER
S
............................................................................ 23
ELECTION
D
ELAY FROM
T
ABLE
.................................................... 25
-D
T
IS
RANSMIT
S
ELECTED
-
TO
-R
....................... 29
ECEIVE
XR16L784
........ 29
REV. P1.0.2