xr16l2450im Exar Corporation, xr16l2450im Datasheet - Page 29
xr16l2450im
Manufacturer Part Number
xr16l2450im
Description
Industry Smallest Package Uart With 2.25v To 5.5v Operation
Manufacturer
Exar Corporation
Datasheet
1.XR16L2450IM.pdf
(30 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
xr16l2450im-F
Manufacturer:
EXAR
Quantity:
500
Company:
Part Number:
xr16l2450im-F
Manufacturer:
Exar Corporation
Quantity:
10 000
xr
2.25V TO 5.5V DUART
GENERAL DESCRIPTION................................................................................................. 1
PACKAGE PIN DESCRIPTIONS ...................................................................................... 3
1.0 PRODUCT DESCRIPTION .................................................................................................................... 6
2.0 FUNCTIONAL DESCRIPTIONS ............................................................................................................ 6
3.0 UART INTERNAL REGISTERS ........................................................................................................... 12
4.0 INTERNAL REGISTER DESCRIPTIONS ............................................................................................ 13
ABSOLUTE MAXIMUM RATINGS .................................................................................. 21
TYPICAL PACKAGE THERMAL RESISTANCE DATA (MARGIN OF ERROR: ± 15%) 21
ELECTRICAL CHARACTERISTICS................................................................................ 21
A
F
ORDERING INFORMATION
P
EATURES
PPLICATIONS
IN
2.1 CPU INTERFACE ............................................................................................................................................. 6
2.2 5-VOLT TOLERANT INPUTS ........................................................................................................................... 6
2.3 DEVICE RESET ................................................................................................................................................ 6
2.4 DEVICE IDENTIFICATION AND REVISION .................................................................................................... 7
2.5 CHANNEL A AND B SELECTION ................................................................................................................... 7
2.6 CHANNEL A AND B INTERNAL REGISTERS ................................................................................................ 7
2.7 INTA AND INTB OUTPUTS .............................................................................................................................. 7
2.8 CRYSTAL OSCILLATOR OR EXTERNAL CLOCK INPUT ............................................................................. 7
2.9 PROGRAMMABLE BAUD RATE GENERATOR ............................................................................................. 8
2.10 TRANSMITTER ............................................................................................................................................... 9
2.11 RECEIVER .................................................................................................................................................... 10
2.12 INTERNAL LOOPBACK ............................................................................................................................... 11
4.1 RECEIVE HOLDING REGISTER (RHR) - READ- ONLY ............................................................................... 13
4.2 TRANSMIT HOLDING REGISTER (THR) - WRITE-ONLY ............................................................................ 13
4.3 INTERRUPT ENABLE REGISTER (IER) - READ/WRITE ............................................................................. 13
4.4 INTERRUPT STATUS REGISTER (ISR) - READ-ONLY ............................................................................... 14
4.5 LINE CONTROL REGISTER (LCR) - READ/WRITE ..................................................................................... 15
4.6 MODEM CONTROL REGISTER (MCR) OR GENERAL PURPOSE OUTPUTS CONTROL - READ/WRITE 17
4.7 LINE STATUS REGISTER (LSR) - READ ONLY ........................................................................................... 17
4.8 MODEM STATUS REGISTER (MSR) - READ ONLY .................................................................................... 18
4.9 SCRATCH PAD REGISTER (SPR) - READ/WRITE ...................................................................................... 19
4.10 BAUD RATE GENERATOR REGISTERS (DLL AND DLM) - READ/WRITE .............................................. 19
4.11 DEVICE IDENTIFICATION REGISTER (DVID) - READ ONLY .................................................................... 19
4.12 DEVICE REVISION REGISTER (DREV) - READ ONLY .............................................................................. 19
F
F
F
T
T
F
T
F
F
F
T
T
T
T
T
D
IGURE
IGURE
IGURE
ABLE
ABLE
IGURE
ABLE
IGURE
IGURE
IGURE
ABLE
ABLE
ABLE
ABLE
ABLE
ESCRIPTIONS
2.10.1 TRANSMIT HOLDING REGISTER (THR) - WRITE ONLY......................................................................................... 9
2.11.1 RECEIVE HOLDING REGISTER (RHR) - READ-ONLY .......................................................................................... 10
4.3.1 INTERRUPT MODE OPERATION .............................................................................................................................. 14
4.3.2 POLLED MODE OPERATION .................................................................................................................................... 14
4.4.1 INTERRUPT GENERATION: ...................................................................................................................................... 15
4.4.2 INTERRUPT CLEARING: ........................................................................................................................................... 15
1: C
2: INTA
3: T
4:
5:
6: I
7: P
8: UART RESET CONDITIONS FOR CHANNEL A AND B.............................................................................................. 20
1. XR16L2450 B
2. P
3.
4. T
5. T
6. R
7. I
..................................................................................................................................................... 1
NTERRUPT
UART CHANNEL A AND B UART INTERNAL REGISTERS ..................................................................................... 12
INTERNAL REGISTERS DESCRIPTION ................................................................................................................... 13
YPICAL DATA RATES WITH A
ARITY SELECTION
HANNEL
NTERNAL
XR16L2450 D
IN
YPICAL OSCILLATOR CONNECTIONS
RANSMITTER
ECEIVER
............................................................................................................................................... 1
O
AND
UT
........................................................................................................................................ 3
A
A
INTB P
L
S
SSIGNMENT
O
AND
OOP
OURCE AND
PERATION
O
LOCK
................................................................................................................................ 2
B S
ATA
PERATION
B
INS
ACK IN
.......................................................................................................................................................... 16
ELECT
D
B
O
US
IAGRAM
..................................................................................................................................................... 2
................................................................................................................................................... 10
PERATION FOR
P
C
I
RIORITY
NTERCONNECTIONS
............................................................................................................................................... 7
............................................................................................................................................... 9
HANNELS
14.7456 MH
......................................................................................................................................... 1
TABLE OF CONTENTS
L
EVEL
................................................................................................................................. 8
A
T
AND
RANSMITTER
Z CRYSTAL OR EXTERNAL CLOCK
....................................................................................................................... 15
B ................................................................................................................ 11
.................................................................................................................. 6
........................................................................................................ 7
I
........................................................................ 9
XR16L2450
REV. 1.1.0