xr16c2450ip Exar Corporation, xr16c2450ip Datasheet - Page 30
xr16c2450ip
Manufacturer Part Number
xr16c2450ip
Description
Dual Uart With Higher Operating Speed And Lower Access Time
Manufacturer
Exar Corporation
Datasheet
1.XR16C2450IP.pdf
(31 pages)
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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