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ST16C2450IP40 Fiches technique(PDF) 8 Page - Exar Corporation

No de pièce ST16C2450IP40
Description  2.97V TO 5.5V DUART
Download  29 Pages
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Fabricant  EXAR [Exar Corporation]
Site Internet  http://www.exar.com
Logo EXAR - Exar Corporation

ST16C2450IP40 Fiches technique(HTML) 8 Page - Exar Corporation

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ST16C2450
áç
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2.97V TO 5.5V DUART
REV. 4.0.0
8
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 100 ppm frequency
tolerance) connected externally between the XTAL1 and XTAL2 pins (see Figure 4), with an external 500 k
Ω to
1 M
Ω 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.
2.7
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 or external
clock of up to 24 MHz.
The 2450 divides the basic external clock by 16. The basic 16X clock provides table rates to support standard
and custom applications using the same system design. The Baud Rate Generator divides the input 16X clock
by any divisor from 1 to 216 -1. The rate table is configured via the DLL and DLM internal register functions.
Customized Baud Rates can be achieved by selecting the proper divisor values for the MSB and LSB sections
of baud rate generator.
Table 3 shows the standard data rates available with a 14.7456 MHz crystal or external clock at 16X sampling
rate. When using a non-standard frequency crystal or external clock, the divisor value can be calculated for
DLL/DLM with the following equation.
FIGURE 4. TYPICAL OSCILLATOR CONNECTIONS
divisor (decimal) = (XTAL1 clock frequency) / (serial data rate x 16)
C1
22-47 pF
C2
22-47 pF
Y1
1.8432 MHz
to
24 MHz
R1
0-120
(Optional)
R2
500 Κ Ω − 1 Μ Ω
XTAL1
XTAL2


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