SC16C550BIB48 NXP Semiconductors, SC16C550BIB48 Datasheet - Page 14

• Manufacturer Part Number: SC16C550BIB48
• Description: UART, 16BYTE FIFO, 16C550, LQFP48
• Manufacturer: NXP Semiconductors

Specifications of SC16C550BIB48

• No. Of Channels: 1
• Data Rate: 3Mbps
• Supply Voltage Range: 2.25V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LQFP
• No. Of Pins: 48
• Svhc: No SVHC (18-Jun-2010)
• Operating: RoHS Compliant
• Uart Features: Automatic Hardware Flow Control, Software Selectable Baud Rate Generator
• Rohs Compliant: Yes

NXP Semiconductors
SC16C550B_5
Product data sheet
6.5 Programmable baud rate generator
The SC16C550B 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.
The SC16C550B can support a standard data rate of 921.6 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 SC16C550B can be configured for internal or external clock operation. For internal
clock oscillator operation, an industry standard microprocessor crystal is connected
externally between the XTAL1 and XTAL2 pins (see
clock can be connected to the XTAL1 pin to clock the internal baud rate generator for
standard or custom rates (see
The generator divides the input 16 clock by any divisor from 1 to (2
SC16C550B divides the basic crystal or external clock by 16. The frequency of the
BAUDOUT output pin is exactly 16 (16 times) the selected baud rate
(BAUDOUT = 16
proper divisor values for the MSB and LSB sections of the 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 examples in
selectable baud rates when using a 1.8432 MHz crystal.
For custom baud rates, the divisor value can be calculated using the following equation:
divisor in decimal
Fig 10. Crystal oscillator connection
baud rate). Customized baud rates can be achieved by selecting the
=
Rev. 05 — 1 October 2008
XTAL1
XTAL1 clock frequency
--------------------------------------------------------------- -
1.8432 MHz
serial data rate 16
C1
22 pF
X1
Table
XTAL2
C2
33 pF
6).
5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs
XTAL1
Figure
1.8432 MHz
C1
22 pF
X1
10). Alternatively, an external
XTAL2
002aaa870
1.5 k
C2
47 pF
SC16C550B
16
© NXP B.V. 2008. All rights reserved.
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