xr16l2450im Exar Corporation, xr16l2450im Datasheet - Page 29

• Manufacturer Part Number: xr16l2450im
• Description: Industry Smallest Package Uart With 2.25v To 5.5v Operation
• Manufacturer: Exar Corporation

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