xr16l2550im Exar Corporation, xr16l2550im Datasheet - Page 45

• Manufacturer Part Number: xr16l2550im
• Description: Industry Smallest Package Uart With 2.25v To 5.5v Operation
• Manufacturer: Exar Corporation

xr
LOW VOLTAGE 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 ........................................................................................................... 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 DMA MODE ...................................................................................................................................................... 8
2.8 INTA AND INTB OUTPUTS .............................................................................................................................. 8
2.9 CRYSTAL OSCILLATOR OR EXTERNAL CLOCK INPUT ............................................................................. 9
2.10 PROGRAMMABLE BAUD RATE GENERATOR ......................................................................................... 10
2.11 TRANSMITTER ............................................................................................................................................. 11
2.12 RECEIVER .................................................................................................................................................... 12
2.13 AUTO RTS (HARDWARE) FLOW CONTROL ............................................................................................. 14
2.14
2.15 AUTO XON/XOFF (SOFTWARE) FLOW CONTROL ................................................................................... 16
2.16
2.17 INFRARED MODE ........................................................................................................................................ 17
2.18
2.19
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
4.4 INTERRUPT STATUS REGISTER (ISR) - READ-ONLY ............................................................................... 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
2.11.1 TRANSMIT HOLDING REGISTER (THR) - WRITE ONLY....................................................................................... 11
2.11.2 TRANSMITTER OPERATION IN NON-FIFO MODE ................................................................................................ 11
2.11.3 TRANSMITTER OPERATION IN FIFO MODE ......................................................................................................... 12
2.12.1 RECEIVE HOLDING REGISTER (RHR) - READ-ONLY .......................................................................................... 13
4.3.1 IER VERSUS RECEIVE FIFO INTERRUPT MODE OPERATION ............................................................................. 22
4.3.2 IER VERSUS RECEIVE/TRANSMIT FIFO POLLED MODE OPERATION................................................................ 22
AUTO CTS FLOW CONTROL ..................................................................................................................... 14
SPECIAL CHARACTER DETECT ............................................................................................................... 16
SLEEP MODE WITH AUTO WAKE-UP ...................................................................................................... 18
INTERNAL LOOPBACK .............................................................................................................................. 19
1: C
2: TXRDY#
3: INTA
4: INTA
5: T
6: A
7:
8: INTERNAL REGISTERS DESCRIPTION. S
1. XR16L2550 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
UART CHANNEL A AND B UART INTERNAL REGISTERS ..................................................................................... 20
YPICAL DATA RATES WITH A
UTO
HANNEL
XR16L2550 D
IN
YPICAL OSCILLATOR CONNECTIONS
XTERNAL
RANSMITTER
RANSMITTER
ECEIVER
PERATING
NFRARED
NTERNAL
............................................................................................................................................... 1
ECEIVER
UTO
O
AND
AND
X
UT
ON
RTS
A
AND
A
INTB P
INTB P
/X
SSIGNMENT
O
C
AND
L
OFF
T
F
O
PERATION IN NON
LOCK
OOP
AND
RANSMIT
RXRDY# O
REQUENCY
PERATION IN
O
O
LOCK
................................................................................................................................ 2
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
..................................................................................................................................................... 2
D
PERATION FOR
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
. R
F
AND
OR
-FIFO M
EQUIRES A
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
ODE
AND
.................................................................................................................... 13
B ................................................................................................................ 19
RTS F
R
.................................................................................................................. 7
2K
............................................................................................................... 16
ECEIVE
HADED BITS ARE ENABLED WHEN
C
.............................................................................................................. 12
DMA M
............................................................................................................... 9
ONTROL
D
OHMS PULL
ATA
LOW
....................................................................................................... 15
........................................................................................................ 9
I
D
R
ODE
ATA
C
ATE
M
ONTROL
ODE
............................................................................................. 8
D
.......................................................................................... 10
-
UP RESISTOR ON
ECODING
..................................................................................... 12
M
ODE
.......................................................................... 17
....................................................................... 13
...................................................................... 11
XTAL2
EFR B
IT
PIN TO INCREASE OPERATING SPEED
-4=1......................................... 21
XR16L2550
REV. 1.1.2
10