XR16C2450IJ EXAR [Exar Corporation], XR16C2450IJ Datasheet - Page 30

• Manufacturer Part Number: XR16C2450IJ
• Description: 2.97V TO 5.5V DUART
• Manufacturer: EXAR [Exar Corporation]

XR16C2450
REV. 1.0.0
GENERAL DESCRIPTION .................................................................................................1
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
DC E
AC E
EATURES
PPLICATIONS
2.1 CPU INTERFACE .............................................................................................................................................. 6
2.2 DEVICE RESET ................................................................................................................................................ 6
2.3 CHANNEL A AND B SELECTION .................................................................................................................... 7
2.4 CHANNEL A AND B INTERNAL REGISTERS ................................................................................................ 7
2.5 INTA AND INTB OUTPUTS .............................................................................................................................. 7
2.6 CRYSTAL OSCILLATOR OR EXTERNAL CLOCK INPUT ............................................................................. 7
2.7 PROGRAMMABLE BAUD RATE GENERATOR ............................................................................................. 8
2.8 TRANSMITTER ................................................................................................................................................. 9
2.9 RECEIVER ...................................................................................................................................................... 10
2.10 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
Unless otherwise noted: TA=-40o to +85oC, Vcc is 2.97V to 5.5V, 70 pF load where applicable ............................ 22
F
F
F
T
T
F
T
F
F
F
T
T
T
T
T
F
F
IGURE
IGURE
IGURE
ABLE
ABLE
IGURE
ABLE
IGURE
IGURE
IGURE
ABLE
ABLE
ABLE
ABLE
ABLE
IGURE
IGURE
LECTRICAL
LECTRICAL
2.8.1 TRANSMIT HOLDING REGISTER (THR) - WRITE ONLY ........................................................................................... 9
2.9.1 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. XR16C2450 B
2. P
3.
4. T
5. T
6. R
7. I
8. C
9. M
.....................................................................................................................................................1
NTERRUPT
YPICAL DATA RATES WITH A
UART CHANNEL A AND B UART INTERNAL REGISTERS...................................................................................... 12
INTERNAL REGISTERS DESCRIPTION ................................................................................................................... 13
ARITY SELECTION
HANNEL
NTERNAL
XR16C2450 D
YPICAL OSCILLATOR CONNECTIONS
RANSMITTER
IN
ECEIVER
LOCK
ODEM
................................................................................................................................................1
O
AND
C
C
UT
HARACTERISTICS
HARACTERISTICS
T
I
A
IMING
NPUT
A
INTB P
L
S
O
SSIGNMENT
AND
OOP
OURCE AND
PERATION
/O
O
.................................................................................................................................2
............................................................................................................................................................... 23
LOCK
B S
PERATION
B
ATA
UTPUT
INS
.......................................................................................................................................................... 16
ACK IN
ELECT
D
B
O
..................................................................................................................................................... 2
US
................................................................................................................................................... 10
IAGRAM
PERATION FOR
T
P
C
IMING
I
RIORITY
NTERCONNECTIONS
............................................................................................................................................... 7
............................................................................................................................................... 9
HANNELS
14.7456 MH
..............................................................................................................21
..............................................................................................................22
......................................................................................................................................... 1
TABLE OF CONTENTS
F
OR
L
EVEL
................................................................................................................................. 8
C
A
T
HANNELS
AND
RANSMITTER
Z CRYSTAL OR EXTERNAL CLOCK
....................................................................................................................... 15
B ................................................................................................................ 11
................................................................................................................. 6
A & B ................................................................................................... 23
........................................................................................................ 7
I
........................................................................ 9
2.97V TO 5.5V DUART
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