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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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ST16C450CP40 Arkusz danych(PDF) 9 Page - Exar Corporation |
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ST16C450CP40 Arkusz danych(HTML) 9 Page - Exar Corporation |
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9 / 28 page  ST16C450 9 Rev. 4.20 Programmable Baud Rate Generator The ST16C450 supports high speed modem tech- nologies that have increased input data rates by employing data compression schemes. For example a 33.6Kbps modem that employs data compression may require a 115.2Kbps input data rate. A 128.0Kbps ISDN modem that supports data compression may need an input data rate of 460.8Kbps. The ST16C450 can support a standard data rate of 921.6Kbps. The programmable Baud Rate Generator is capable of accepting an input clock up to 24 MHz, as required for supporting a 1.5Mbps data rate. The ST16C450 can be configured for internal or external clock operation. For internal clock oscillator operation, an industry standard microprocessor crystal (parallel resonant/ 22-33 pF load) is connected externally between the XTAL1 and XTAL2 pins, with an external 1 M Ω resistor across it. Table 3, BAUD RATE GENERATOR PROGRAMMING TABLE (1.8432 MHz CLOCK): Output User User DLM DLL Baud Rate 16 x Clock 16 x Clock Program Program Divisor Divisor Value Value (Decimal) (HEX) (HEX) (HEX) 50 2304 900 09 00 75 1536 600 06 00 150 768 300 03 00 300 384 180 01 80 600 192 C0 00 C0 1200 96 60 00 60 2400 48 30 00 30 4800 24 18 00 18 7200 16 10 00 10 9600 12 0C 00 0C 19.2k 6 06 00 06 38.4k 3 03 00 03 57.6k 2 02 00 02 115.2k 1 01 00 01 Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal baud rate generator for standard or custom rates. See figure 3 for crystal oscillator connection. The generator divides the input 16X clock by any divisor from 1 to 216 -1. The ST16C450 divides the basic crystal or external clock by 16. The frequency of the -BAUDOUT output pin is exactly 16X (16 times) of the selected baud rate (-BAUDOUT =16 x Baud Rate). Customized Baud Rates can be achieved by selecting the proper divisor values for the MSB and LSB sections of baud rate generator. Programming the Baud Rate Generator Registers DLM (MSB) and DLL (LSB) provides a user capability for selecting the desired final baud rate. The example in Table 3 below. |
Podobny numer części - ST16C450CP40 |
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Podobny opis - ST16C450CP40 |
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