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參數(shù)資料
| 型號： | XRT16L2552 |
| 廠商： | Exar Corporation |
| 英文描述： | 2.25V TO 5.5V DUART WITH 16-BYTE FIFO |
| 中文描述： | 2.25V至5.5V的杜阿爾特16字節(jié)FIFO |
| 文件頁數(shù)： | 10/47頁 |
| 文件大?。?/td> | 413K |
| 代理商： | XRT16L2552 |
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XR16L2552
2.25V TO 5.5V DUART WITH 16-BYTE FIFO
xr
REV. 1.1.1
10
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 20-120 ohms and 100ppm frequency
tolerance) connected externally between the XTAL1 and XTAL2 pins (see
Figure 2
), with an external 500k
to
1 M
resistor across it. 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.
2.11
Programmable Baud Rate Generator
A single baud rate generator 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 resistor on XTAL2 pin (as
shown in
Figure 5
) it can extend its operation up to 64 MHz (4Mbps serial data rate) at room temperature and
5.0V.
F
IGURE
4. T
YPICAL
OSCILLATOR
CONNECTIONS
F
IGURE
5. E
XTERNAL
C
LOCK
C
ONNECTION
FOR
E
XTENDED
D
ATA
R
ATE
C1
22-47 pF
C2
22-47 pF
Y1
1.8432 MHz
to
24 MHz
R1
0-120
(Optional)
R2
500 K
1 M
XTAL1
XTAL2
2K
XTAL1
XTAL2
R1
VCC
External Clock
vcc
gnd
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