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參數(shù)資料
| 型號： | SC16C650A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Universal Asynchronous Receiver/Transmitter (UART) with 32-byte FIFO and infrared (IrDA) encoder/decoder |
| 中文描述： | 通用異步接收器/發(fā)送器（UART）與32字節(jié)的FIFO和紅外（IrDA）編碼器/解碼器 |
| 文件頁數(shù)： | 13/50頁 |
| 文件大小： | 642K |
| 代理商： | SC16C650A |
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Philips Semiconductors
SC16C650A
UART with 32-byte FIFO and IrDA encoder/decoder
Product data
Rev. 04 — 20 June 2003
13 of 50
9397 750 11622
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6.7 Programmable baud rate generator
The SC16C650A 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 Mbits/s data rate. The SC16C650A can be configured for internal or external clock
operation. For internal clock oscillator operation, an industry standard microprocessor
crystal (parallel resonant/22-33 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 2
16
1. The
SC16C650A 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.
Setting MCR[7] to a logic 1 provides an additional divide-by-4, whereas setting
MCR[7] to a logic 0 only divides by 1 (see
Table 5
and
Figure 6
).
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 and setting
MCR[7] to a logic 0.
For custom baud rates, the divisor value can be calculated using the following
equation:
(1)
Fig 5.
Crystal oscillator connection.
002aaa169
X1
1.8432 MHz
C1
22 pF
C2
47 pF
X
X
X1
1.8432 MHz
C1
47 pF
C2
100 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 |
|---|---|
| SC16C650AIA44 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Asynchronous Receiver/Transmitter (UART) with 32-byte FIFO and infrared (IrDA) encoder/decoder |
| SC16C650AIA44,512 | 功能描述:UART 接口集成電路 16C 2.5V-5V 1CH UART 32B 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 |
| SC16C650AIA44,518 | 功能描述:UART 接口集成電路 16C 2.5V-5V 1CH UART 32B 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 |
| SC16C650AIA44,529 | 功能描述:UART 接口集成電路 16C 2.5V-5V 1CH UART 32B 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 |
| SC16C650AIB48 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Asynchronous Receiver/Transmitter (UART) with 32-byte FIFO and infrared (IrDA) encoder/decoder |
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