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SC16C750BIB64 Datasheet(PDF) 11 Page - NXP Semiconductors

Part # SC16C750BIB64
Description  5 V, 3.3 V and 2.5 V UART with 64-byte FIFOs
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

SC16C750BIB64 Datasheet(HTML) 11 Page - NXP Semiconductors

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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
X1
1.8432 MHz
C1
22 pF
divisor in decimal
()
XTAL1 clock frequency
serial data rate
16
×
----------------------------------------------------------------
=


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