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參數(shù)資料
| 型號： | SC16C550B |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs |
| 中文描述： | 5伏，3.3伏和2.5伏的UART具有16字節(jié)的FIFO |
| 文件頁數(shù)： | 14/47頁 |
| 文件大?。?/td> | 229K |
| 代理商： | SC16C550B |
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Philips Semiconductors
SC16C550B
5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs
Product data
Rev. 02 — 14 December 2004
14 of 47
9397 750 14446
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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
Figure 9
).
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 6
).
The generator divides the input 16
×
clock by any divisor from 1 to 2
16
1. The
SC16C550B 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 6
shows selectable baud rates when using a 1.8432 MHz crystal.
For custom baud rates, the divisor value can be calculated using the following
equation:
(1)
Fig 9.
Crystal oscillator connection.
002aaa586
X1
1.8432 MHz
C1
22 pF
C2
47 pF
X
X
X1
1.8432 MHz
C1
22 pF
C2
33 pF
X
X
1.5 k
Divisor (in decimal)
serial data rate
16
×
----------------------------------------------------------
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC16C550BIA44 | 功能描述:UART 接口集成電路 16CB 2.5V-5V 1CH UART 16B FIFO RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| SC16C550BIA44,512 | 功能描述:UART 接口集成電路 16CB 2.5V-5V 1CH RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| SC16C550BIA44,518 | 功能描述:UART 接口集成電路 1CH. UART 16B FIFO RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| SC16C550BIA44,529 | 功能描述:UART 接口集成電路 16CB 2.5V-5V 1CH RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| SC16C550BIA44512 | 制造商:NXP Semiconductors 功能描述:IC SINGLE UART FIFO 3MBPS 5.5V LCC44 |
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