Datenblatt-Suchmaschine für elektronische Bauteile |
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ST16C454IJ68 Datenblatt(PDF) 11 Page - Exar Corporation |
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ST16C454IJ68 Datenblatt(HTML) 11 Page - Exar Corporation |
11 / 30 page ST16C454/68C454 11 Rev. 3.20 Programmable Baud Rate Generator The 454 supports high speed modem technologies 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 454 can support a stan- dard data rate of 921.6Kbps. Single baud rate generator is provided for the trans- mitter and receiver, allowing independent TX/RX channel control. The programmable Baud Rate Gen- erator is capable of accepting an input clock up to 24 MHz, as required for supporting a 1.5Mbps data rate. The 454 can be configured for internal or external clock operation. For internal clock oscillator opera- tion, an industry standard microprocessor crystal (par- allel resonant/ 22-33 pF load) is connected externally between the XTAL1 and XTAL2 pins (see figure 8). Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal baud rate generator for standard or custom rates. (see Baud Rate Genera- tor Programming). The generator divides the input 16X clock by any divisor from 1 to 216 -1. The 454 divides the basic crystal or external clock by 16. Further division of this 16X clock provides two table rates to support low and high data rate applications using the same system design. 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 5 below, shows the two selectable baud rate tables available when using a 1.8432MHz or 7.3728 MHz crystal. Output Output User User DLM DLL Baud Rate Baud Rate 16 x Clock 16 x Clock Program Program (1.8432 MHz (7.3728 MHz Divisor Divisor Value Value Clock) Clock) (Decimal) (HEX) (HEX) (HEX) 50 200 2304 900 09 00 300 1200 384 180 01 80 600 2400 192 C0 00 C0 1200 4800 96 60 00 60 2400 9600 48 30 00 30 4800 19.2K 24 18 00 18 9600 38.4k 12 0C 00 0C 19.2k 76.8k 6 06 00 06 38.4k 153.6k 3 03 00 03 57.6k 230.4k 2 02 00 02 115.2k 460.8k 1 01 00 01 |
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