SC16C550IA44,529 NXP Semiconductors, SC16C550IA44,529 Datasheet - Page 15

• Manufacturer Part Number: SC16C550IA44,529
• Description: IC UART SINGLE W/FIFO 44-PLCC
• Manufacturer: NXP Semiconductors

Specifications of SC16C550IA44,529

• Features: Programmable
• Number Of Channels: 1, UART
• Fifo's: 16 Byte
• Voltage - Supply: 2.5V, 3.3V, 5V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• With Cmos: Yes
• Mounting Type: Surface Mount
• Package / Case: 44-LCC (J-Lead)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-3264-5; 935270058529; SC16C550IA44-S

Philips Semiconductors
9397 750 11619
Product data
6.7 Programmable baud rate generator
The SC16C550 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 SC16C550 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 Mbits/s data rate. The SC16C550 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
Alternatively, an external 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
SC16C550 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
For custom baud rates, the divisor value can be calculated using the following
equation:
Divisor (in decimal)
Fig 9. Crystal oscillator connection.
shows selectable baud rates when using a 1.8432 MHz crystal.
Rev. 05 — 19 June 2003
=
C1
47 pF
1.8432 MHz
XTAL1 clock frequency
---------------------------------------------------------- -
X1
serial data rate 16
UART with 16-byte FIFO and IrDA encoder/decoder
C2
100 pF
1.8432 MHz
C1
22 pF
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
X1
1.5 k
Table
C2
47 pF
SC16C550
002aaa169
16
5).
1. The
Figure
15 of 52
9).
(1)