xr16l2552im Exar Corporation, xr16l2552im Datasheet - Page 46

• Manufacturer Part Number: xr16l2552im
• Description: Industry Smallest Package Uart With 2.25v To 5.5v Operation
• Manufacturer: Exar Corporation

XR16L2552
2.25V TO 5.5V DUART WITH 16-BYTE FIFO
GENERAL DESCRIPTION .................................................................................................1
PIN DESCRIPTIONS .........................................................................................................3
1.0 PRODUCT DESCRIPTION .....................................................................................................................6
2.0 FUNCTIONAL DESCRIPTIONS .............................................................................................................7
3.0 UART INTERNAL REGISTERS ...........................................................................................................21
4.0 INTERNAL REGISTER DESCRIPTIONS .............................................................................................23
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 .................................................................................................................... 8
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 OUPUTS ................................................................................................................................ 9
2.10 CRYSTAL OSCILLATOR OR EXTERNAL CLOCK INPUT ........................................................................... 9
2.11 PROGRAMMABLE BAUD RATE GENERATOR ......................................................................................... 10
2.12 TRANSMITTER ............................................................................................................................................. 12
2.13 RECEIVER .................................................................................................................................................... 13
2.14 AUTO RTS (HARDWARE) FLOW CONTROL ............................................................................................. 15
2.15
2.16 AUTO XON/XOFF (SOFTWARE) FLOW CONTROL ................................................................................... 17
2.17
2.18 INFRARED MODE ........................................................................................................................................ 18
2.19
2.20
4.1 RECEIVE HOLDING REGISTER (RHR) - READ- ONLY ............................................................................... 23
4.2 TRANSMIT HOLDING REGISTER (THR) - WRITE-ONLY ............................................................................ 23
4.3 BAUD RATE GENERATOR DIVISORS (DLL AND DLM) - READ/WRITE ................................................... 23
4.4 INTERRUPT ENABLE REGISTER (IER) - READ/WRITE .............................................................................. 23
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 ....................................................................................... 12
2.12.2 TRANSMITTER OPERATION IN NON-FIFO MODE ................................................................................................ 12
2.12.3 TRANSMITTER OPERATION IN FIFO MODE ......................................................................................................... 12
2.13.1 RECEIVE HOLDING REGISTER (RHR) - READ-ONLY .......................................................................................... 13
AUTO CTS FLOW CONTROL ..................................................................................................................... 15
SPECIAL CHARACTER DETECT ............................................................................................................... 17
SLEEP MODE WITH AUTO WAKE-UP ....................................................................................................... 19
INTERNAL LOOPBACK .............................................................................................................................. 20
1: C
2: TXRDY#
3: INTA
4: INTA
5: T
6: A
7:
8: INTERNAL REGISTERS DESCRIPTION. S
1. XR16L2552 B
2. P
3.
4. T
5. E
6. O
7. T
8. T
9. R
10. R
11. A
12. I
13. I
.....................................................................................................................................................1
11
YPICAL DATA RATES WITH A
UART CHANNEL A AND B UART INTERNAL REGISTERS...................................................................................... 21
UTO
HANNEL
XR16L2552 D
YPICAL OSCILLATOR CONNECTIONS
RANSMITTER
RANSMITTER
IN
XTERNAL
ECEIVER
PERATING
NFRARED
NTERNAL
................................................................................................................................................1
UTO
ECEIVER
O
AND
AND
X
UT
ON
RTS
A
AND
A
INTB P
INTB P
/X
O
SSIGNMENTS
C
AND
L
OFF
T
O
F
PERATION IN NON
LOCK
OOP
AND
RANSMIT
RXRDY# O
REQUENCY
PERATION IN
O
O
.................................................................................................................................2
LOCK
B S
ATA
PERATION IN NON
PERATION IN
(S
INS
IN
CTS F
B
C
OFTWARE
ACK IN
ELECT
O
ONNECTION FOR
D
B
O
PERATION
US
IAGRAM
D
PERATION FOR
................................................................................................................................................... 2
ATA
LOW
C
I
UTPUTS IN
NTERCONNECTIONS
............................................................................................................................................... 8
C
HART
FIFO
14.7456 MH
) F
HANNEL
E
FIFO
C
-FIFO M
NCODING AND
......................................................................................................................................... 1
TABLE OF CONTENTS
LOW
ONTROL
F
. R
AND
OR
-FIFO M
AND
............................................................................................................................... 10
EQUIRES A
C
FIFO
A
R
E
A
ONTROL
T
XTENDED
ODE
ECEIVER
AND
UTO
RANSMITTER
O
F
Z CRYSTAL OR EXTERNAL CLOCK
LOW
PERATION
ODE
AND
.................................................................................................................... 14
B ................................................................................................................ 20
RTS F
R
.................................................................................................................. 7
ECEIVE
HADED BITS ARE ENABLED WHEN
............................................................................................................... 17
C
2K
.............................................................................................................. 12
DMA M
............................................................................................................... 9
ONTROL
D
ATA
OHMS PULL
LOW
....................................................................................................... 16
........................................................................................................ 9
I
D
R
ODE
ATA
C
ATE
M
ONTROL
ODE
............................................................................................. 9
D
.......................................................................................... 10
-
ECODING
UP RESISTOR ON
..................................................................................... 13
M
ODE
.......................................................................... 18
....................................................................... 14
...................................................................... 11
EFR B
XTAL2
IT
PIN TO INCREASE OPERATING SPEED
-4=1......................................... 22
xr
REV. 1.1.1