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SC16C750BIB64 Datasheet(PDF) 11 Page - NXP Semiconductors |
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SC16C750BIB64 Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 44 page SC16C750B_5 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 05 — 17 October 2008 11 of 44 NXP Semiconductors SC16C750B 5 V, 3.3 V and 2.5 V UART with 64-byte FIFOs 6.5 Programmable baud rate generator The SC16C750B supports high speed modem technologies that have increased input data rates by employing data compression schemes. For example, a 33.6 kbit/s modem that employs data compression may require a 115.2 kbit/s input data rate. A 128.0 kbit/s ISDN modem that supports data compression may need an input data rate of 460.8 kbit/s. 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 accepting an input clock up to 48 MHz, as required for supporting a 3 Mbit/s data rate. The SC16C750B can be configured for internal or external clock operation. For internal clock oscillator operation, an industry standard microprocessor crystal (parallel resonant, 22 pF to 33 pF load) is connected externally between the XTAL1 and XTAL2 pins (see Figure 5). Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal baud rate generator for standard or custom rates (see Table 5). The generator divides the input 16 × clock by any divisor from 1 to (216 − 1). The SC16C750B divides the basic crystal or external clock by 16. The frequency of the BAUDOUT output pin is exactly 16 × (16 times) of the selected baud rate (BAUDOUT = 16 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 5 shows selectable baud rates when using a 1.8432 MHz crystal. For custom baud rates, the divisor value can be calculated using Equation 1: (1) Fig 5. Crystal oscillator connection 002aaa870 C2 47 pF XTAL1 XTAL2 X1 1.8432 MHz C1 22 pF C2 33 pF XTAL1 XTAL2 1.5 k Ω X1 1.8432 MHz C1 22 pF divisor in decimal () XTAL1 clock frequency serial data rate 16 × ---------------------------------------------------------------- = |
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