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ST16C2450 Fiches technique(PDF) 8 Page - Exar Corporation |
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ST16C2450 Fiches technique(HTML) 8 Page - Exar Corporation |
8 / 29 page ST16C2450 áç áç áç áç 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 Ω (Optional) R2 500 Κ Ω − 1 Μ Ω XTAL1 XTAL2 |
Numéro de pièce similaire - ST16C2450 |
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Description similaire - ST16C2450 |
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