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參數資料
| 型號： | ST16C2550 |
| 廠商： | Exar Corporation |
| 英文描述： | Dual UART with 16-Byte of Transmit and Receive FIFO(雙通用異步接收器/發(fā)送器（帶16字節(jié)接收和發(fā)送先進先出）) |
| 中文描述： | 雙UART具有16的發(fā)送和接收FIFO（雙通用異步接收器/發(fā)送器（帶16字節(jié)接收和發(fā)送先進先出字節(jié)）） |
| 文件頁數： | 10/34頁 |
| 文件大?。?/td> | 314K |
| 代理商： | ST16C2550 |
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ST16C2550
10
Rev. 3.40
with parity and one stop bit, the time out will be:
T = 4 X 7(programmed word length) + 12 = 40 bit times.
Character time = 40 / 10 [ (programmed word length =
7) + (parity = 1) + (stop bit = 1) + (start bit = 1) = 4
characters.
Programmable Baud Rate Generator
The 2550 supports high speed modem technologies
that have increased input data rates by employing
data compression schemes. For example a 33.6Kbps
modem that employs data compression may require a
115.2Kbps input data rate. A 128.0Kbps ISDN modem
that supports data compression may need an input
data rate of 460.8Kbps. The 2550 can support a
standard data rate of 921.6Kbps.
A single baud rate generator is provided for the trans-
mitter and receiver, allowing independent TX/RX chan-
nel control. The programmable Baud Rate Generator is
capable of operating with a crystal frequency of up to 24
MHz. However, with an external clock input on XTAL1
pin and a 2K ohms pull-up resistor on XTAL2 pin it can
extend its operation up to 64 MHz ( 4Mbps serial data
rate) at room temperature and 5.0V. To obtain maxi-
mum data rate, it is necessary to use full rail swing on
the clock input. See external clock operating frequency
over power supply voltage chart on next page.
The 2550
can be configured for internal or external clock opera-
tion. 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, with an external 1 M
resistor across
it. Alternatively, an external clock can be connected to
the XTAL1 pin to clock the internal baud rate generator
for standard or custom rates. (see Baud Rate Generator
Programming).
The generator divides the input 16X clock by any divisor
from 1 to 2
16
-1. The 2550 divides the basic external
clock by 16. The basic 16X clock provides table rates to
support standard and custom applications using the
same system design. The rate table is configured via the
DLL and DLM internal register functions. 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 4 below, shows the selectable baud rate table
available when using a 1.8432 MHz external clock input.
Crystal Oscillator Connection
C1
22-47pF
C2
22-47pF
Y1
1.8432 MHz
50-120
R2
1M
X
X
R1
2K
XTAL1
XTAL2
R1
VCC
External Clock
vcc
gnd
External Clock Connection for Extended Data Rate
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ST16C2550_04 | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.97V TO 5.5V DUART WITH 16-BYTE FIFO |
| ST16C2550CJ-0A-EB | 功能描述:界面開發(fā)工具 Supports C2550 44 ld PLCC, ISA Interface RoHS:否 制造商:Bourns 產品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| ST16C2550CJ44 | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.97V TO 5.5V DUART WITH 16-BYTE FIFO |
| ST16C2550CJ44-F | 功能描述:UART 接口集成電路 2.97V-5.5V 16B FIFO temp 0C to 70C; UART RoHS:否 制造商:Texas Instruments 通道數量:2 數據速率: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 |
| ST16C2550CJ44TR-F | 功能描述:UART 接口集成電路 DUAL UART W/16BYTE FIFO RoHS:否 制造商:Texas Instruments 通道數量:2 數據速率: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 |
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