參數(shù)資料
型號： XR16C2850IM48
廠商： EXAR CORP
元件分類： 微控制器/微處理器
英文描述： 3.3V AND 5V DUART WITH 128-BYTE FIFO
中文描述： 2 CHANNEL(S), 6.25M bps, SERIAL COMM CONTROLLER, PQFP48
封裝： 7 X 7 MM, 1 MM HEIGHT, TQFP-48
文件頁數(shù)： 9/43頁
文件大?。?/td> 611K
代理商： XR16C2850IM48
XR16C2850
REV. 2.0.0
3.3V AND 5V DUART WITH 128-BYTE FIFO
á
9
2.8
The 2850 includes an on-chip oscillator (XTAL1 and
XTAL2) to produce a clock for both UART sections in
the device. The CPU data bus does not require this
clock for bus operation. The crystal oscillator provides
a system clock to the Baud Rate Generators (BRG)
section found in each of the UART. XTAL1 is the input
to the oscillator or external clock buffer input with
XTAL2 pin being the output. For programming details,
see “Programmable Baud Rate Generator.”
C
RYSTAL
O
SCILLATOR
OR
E
XT
. C
LOCK
I
NPUT
MP
The on-chip oscillator is designed to use an industry
standard microprocessor crystal (parallel resonant,
fundamental frequency with 10-22 pF capacitance
load, ESR of 20-80 ohms and 100ppm frequency tol-
erance) connected externally between the XTAL1 and
XTAL2 pins (see Figure 4). Alternatively, an external
clock can be connected to the XTAL1 pin to clock the
internal baud rate generator for standard or custom
rates. Typical oscillator connections are shown in
Figure 4. For further reading on oscillator circuit
please see application note DAN108 on EXAR’s web
site.
2.9
P
ROGRAMMABLE
B
AUD
R
ATE
G
ENERATOR
A single Baud Rate Generator (BRG) is provided for
the transmitter and receiver, allowing independent
TX/RX channel control. The programmable Baud
Rate Generator is capable of operating with a crystal
frequency of up to 24 MHz. However, with an external
clock input on XTAL1 pin and a 2K ohms pull-up re-
sistor on XTAL2 pin (as shown in Figure 5) it can ex-
tend its operation up to 50 MHz (3.125 Mbps serial
data rate) at room temperature and 5.0V.
Each UART also has their own prescaler along with
the BRG. The prescaler is controlled by CLKSEL
hardware pin or a software bit in the MCR register.
The MCR register bit-7 sets the prescaler to divide
the input crystal or external clock by 1 or 4 and can
override the CLKSEL pin following reset. The clock
output of the prescaler goes to the BRG. The BRG
further divides this clock by a programmable divisor
between 1 and (2
16
-1) to obtain a 16X sampling rate
clock of the serial data rate. The sampling rate clock
is used by the transmitter for data bit shifting and
re-
ceiver for data sampling.
T
ABLE
4: INTA
AND
INTB P
IN
O
PERATION
F
OR
R
ECEIVER
FCR B
IT
-0 = 0
(FIFO D
ISABLED
)
FCR B
IT
-0 = 1
(FIFO E
NABLED
)
INTA/B Pin 0 = no data
1 = 1 byte
0 = FIFO below trigger level
1 = FIFO above trigger level
F
IGURE
4. T
YPICAL
OSCILLATOR
CONNECTIONS
C1
22-47 pF
C2
22-47 pF
Y1
1.8432 MHz
to
24 MHz
R1
0-120
(Optional)
R2
500 Κ 1 Μ
XTAL1
XTAL2
F
IGURE
5. E
XTERNAL
C
LOCK
C
ONNECTION
FOR
E
XTENDED
D
ATA
R
ATE
2K
XTAL1
XTAL2
R1
VCC
External Clock
vcc
gnd
相關(guān)PDF資料
PDF描述
XR16C2850IP40 3.3V AND 5V DUART WITH 128-BYTE FIFO
XR16C2850CJ DUAL UART WITH 128-byte FIFO’s AND RS-485 HALF DUPLEX CONTROL
XR16C2850CM DUAL UART WITH 128-byte FIFO’s AND RS-485 HALF DUPLEX CONTROL
XR16C2850CP DUAL UART WITH 128-byte FIFO’s AND RS-485 HALF DUPLEX CONTROL
XR16C2850IJ DUAL UART WITH 128-byte FIFO’s AND RS-485 HALF DUPLEX CONTROL
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR16C2850IM-F 功能描述:UART 接口集成電路 2.97V-5.5V 128B FIFO temp -45 to 85C;UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR16C2850IMTR-F 制造商:Exar Corporation 功能描述:XR16C2850IMTR-F
XR16C2850IP 制造商:EXAR 制造商全稱:EXAR 功能描述:DUAL UART WITH 128-byte FIFO’s AND RS-485 HALF DUPLEX CONTROL
XR16C2850IP40 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V AND 5V DUART WITH 128-BYTE FIFO
XR16C2852 制造商:EXAR 制造商全稱:EXAR 功能描述:2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS
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