xr16l2752ij Exar Corporation, xr16l2752ij Datasheet - Page 48

• Manufacturer Part Number: xr16l2752ij
• Description: 2.25v To 5.5v Duart With 64-byte Fifo
• Manufacturer: Exar Corporation

XR16L2752
REV. 1.2.1
GENERAL DESCRIPTION .................................................................................................1
PIN DESCRIPTIONS .........................................................................................................3
1.0 PRODUCT DESCRIPTION .....................................................................................................................6
2.0 FUNCTIONAL DESCRIPTIONS .............................................................................................................7
3.0 UART INTERNAL REGISTERS ...........................................................................................................20
4.0 INTERNAL REGISTER DESCRIPTIONS .............................................................................................22
A
F
ORDERING INFORMATION
EATURES
PPLICATIONS
2.1 CPU INTERFACE .............................................................................................................................................. 7
2.2 5-VOLT TOLERANT INPUTS ........................................................................................................................... 7
2.3 DEVICE RESET ................................................................................................................................................ 7
2.4 DEVICE IDENTIFICATION AND REVISION ..................................................................................................... 7
2.5 CHANNEL A AND B SELECTION .................................................................................................................... 7
2.6 CHANNEL A AND B INTERNAL REGISTERS ................................................................................................ 8
2.7 SIMULTANEOUS WRITE TO CHANNEL A AND B ......................................................................................... 8
2.8 DMA MODE ....................................................................................................................................................... 8
2.9 INTA AND INTB OUTPUTS .............................................................................................................................. 9
2.10 CRYSTAL OSCILLATOR OR EXTERNAL CLOCK INPUT ........................................................................... 9
2.11 PROGRAMMABLE BAUD RATE GENERATOR ......................................................................................... 10
2.12 TRANSMITTER ............................................................................................................................................. 11
2.13 RECEIVER .................................................................................................................................................... 12
2.14 AUTO RTS (HARDWARE) FLOW CONTROL ............................................................................................. 14
2.15
2.16
2.17 AUTO XON/XOFF (SOFTWARE) FLOW CONTROL ................................................................................... 16
2.18
2.19
2.20 INFRARED MODE ........................................................................................................................................ 17
2.21
2.22
4.1 RECEIVE HOLDING REGISTER (RHR) - READ- ONLY ............................................................................... 22
4.2 TRANSMIT HOLDING REGISTER (THR) - WRITE-ONLY ............................................................................ 22
4.3 INTERRUPT ENABLE REGISTER (IER) - READ/WRITE .............................................................................. 22
F
F
F
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
IGURE
IGURE
IGURE
ABLE
IGURE
IGURE
IGURE
IGURE
IGURE
ABLE
IGURE
IGURE
ABLE
ABLE
2.12.1 TRANSMIT HOLDING REGISTER (THR) - WRITE ONLY ....................................................................................... 11
2.12.2 TRANSMITTER OPERATION IN NON-FIFO MODE ................................................................................................ 11
2.12.3 TRANSMITTER OPERATION IN FIFO MODE ......................................................................................................... 12
2.13.1 RECEIVE HOLDING REGISTER (RHR) - READ-ONLY .......................................................................................... 13
AUTO RTS HYSTERESIS ............................................................................................................................ 14
AUTO CTS FLOW CONTROL ..................................................................................................................... 14
SPECIAL CHARACTER DETECT ............................................................................................................... 16
AUTO RS485 HALF-DUPLEX CONTROL .................................................................................................. 16
SLEEP MODE WITH AUTO WAKE-UP ....................................................................................................... 18
INTERNAL LOOPBACK .............................................................................................................................. 19
1: C
2: TXRDY#
3: INTA
4: INTA
5: T
6: A
7: UART CHANNEL A AND B UART INTERNAL REGISTERS....................................................................................... 20
8: INTERNAL REGISTERS DESCRIPTION. S
1. XR16L2752 B
2. P
3. XR16L2750 D
4. T
5. E
6. B
7. T
8. T
9. R
10. R
11. A
12. I
13. I
.....................................................................................................................................................1
YPICAL DATA RATES WITH A
UTO
HANNEL
YPICAL OSCILLATOR CONNECTIONS
RANSMITTER
RANSMITTER
IN
XTERNAL
AUD
ECEIVER
NFRARED
NTERNAL
................................................................................................................................................1
UTO
ECEIVER
O
AND
AND
X
UT
R
ON
RTS
ATE
A
AND
A
INTB P
INTB P
/X
O
SSIGNMENT
C
AND
L
OFF
T
O
G
PERATION IN NON
LOCK
OOP
AND
RANSMIT
RXRDY# O
PERATION IN
ENERATOR AND
O
O
.................................................................................................................................2
LOCK
ATA
B S
PERATION IN NON
PERATION IN
(S
INS
IN
CTS F
B
C
OFTWARE
B
ACK IN
ELECT
O
ONNECTION FOR
D
US
O
PERATION
IAGRAM
..................................................................................................................................................... 2
D
PERATION FOR
I
ATA
LOW
NTERCONNECTIONS
UTPUTS IN
............................................................................................................................................... 8
C
FIFO
14.7456 MH
) F
HANNEL
E
FIFO
C
-FIFO M
P
NCODING AND
......................................................................................................................................... 1
TABLE OF CONTENTS
LOW
ONTROL
RESCALER
F
AND
OR
-FIFO M
AND
................................................................................................................................. 9
C
FIFO
A
R
E
A
ONTROL
T
XTENDED
ODE
ECEIVER
AND
UTO
RANSMITTER
O
F
Z CRYSTAL OR EXTERNAL CLOCK
LOW
PERATION
..................................................................................................................... 10
ODE
AND
.................................................................................................................... 13
B ................................................................................................................ 19
RTS F
.................................................................................................................... 7
R
ECEIVE
HADED BITS ARE ENABLED WHEN
............................................................................................................... 16
C
.............................................................................................................. 12
DMA M
............................................................................................................... 9
ONTROL
D
ATA
LOW
....................................................................................................... 15
........................................................................................................ 9
I
D
R
ODE
ATA
C
ATE
M
ONTROL
ODE
............................................................................................. 8
D
.......................................................................................... 10
ECODING
..................................................................................... 12
2.25V TO 5.5V DUART WITH 64-BYTE FIFO
M
ODE
.......................................................................... 17
....................................................................... 13
...................................................................... 11
EFR B
IT
-4=1......................................... 21
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