參數(shù)資料
型號(hào)： SC16C754
廠商： NXP Semiconductors N.V.
英文描述： Quad UART with 64-byte FIFO
中文描述： 四UART的64字節(jié)FIFO
文件頁(yè)數(shù)： 18/49頁(yè)
文件大?。?/td> 622K
代理商： SC16C754
Philips Semiconductors
SC16C754
Quad UART with 64-byte FIFO
Product data
Rev. 04 — 19 June 2003
18 of 49
9397 750 11618
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6.8 Break and time-out conditions
An RX idle condition is detected when the receiver line, RX, has been HIGH for
4 character time. The receiver line is sampled midway through each bit.
When a break condition occurs, the TX line is pulled LOW. A break condition is
activated by setting LCR[6].
6.9 Programmable baud rate generator
The SC16C754 UART contains a programmable baud generator that takes any clock
input and divides it by a divisor in the range between 1 and (2
16
1). An additional
divide-by-4 prescaler is also available and can be selected by MCR[7], as shown in
Figure 12
. The output frequency of the baud rate generator is 16
×
the baud rate. The
formula for the divisor is:
Where:
prescaler = 1, when MCR[7] is set to 0 after reset (divide-by-1 clock selected)
prescaler = 4, when MCR[7] is set to 1 after reset (divide-by-4 clock selected).
Remark:
The default value of prescaler after reset is divide-by-1.
Figure 12
shows the internal prescaler and baud rate generator circuitry.
DLL and DLH must be written to in order to program the baud rate. DLL and DLH are
the least significant and most significant byte of the baud rate divisor. If DLL and DLH
are both zero, the UART is effectively disabled, as no baud clock will be generated.
Remark:
The programmable baud rate generator is provided to select both the
transmit and receive clock rates.
Table 7
and
Table 8
show the baud rate and divisor correlation for crystal with
frequency 1.8432 MHz and 3.072 MHz, respectively.
Figure 13
shows the crystal clock circuit reference.
Fig 12. Prescaler and baud rate generator block diagram.
divisor
XTAL1 crystal input frequency
prescaler
desired baud rate
---------------------------------------------------------------------------
--------------------------------------------------------------------------------
16
=
BAUD RATE
GENERATOR
LOGIC
MCR[7] = 1
MCR[7] = 0
PRESCALER
LOGIC
(DIVIDE-BY-1)
INTERNAL
OSCILLATOR
LOGIC
002aaa233
XTAL1
XTAL2
INPUT CLOCK
PRESCALER
LOGIC
(DIVIDE-BY-4)
REFERENCE
CLOCK
INTERNAL
BAUD RATE
CLOCK FOR
TRANSMITTER
AND
RECEIVER
相關(guān)PDF資料
PDF描述
SC16C754IA68 Quad UART with 64-byte FIFO
SC16C754IB80 Quad UART with 64-byte FIFO
SC2000 Universal Timeslot Interchange
SC2001G-10 Bus Exchanger
SC2001G-13 Bus Exchanger
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC16C754B 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 64-byte FIFOs
SC16C754BIA68 功能描述:UART 接口集成電路 16CB 2.5V-5V 4CH UART 64B 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
SC16C754BIA68,512 功能描述:UART 接口集成電路 16CB 2.5V-5V 4CH 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
SC16C754BIA68,518 功能描述:UART 接口集成電路 4CH. UART 64B 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
SC16C754BIA68,529 功能描述:UART 接口集成電路 16CB 2.5V-5V 4CH 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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*