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| 型號： | SC16IS741IPW |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Single UART with I2C-bus-SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support |
| 中文描述： | 1 CHANNEL(S), 5M bps, I2C BUS CONTROLLER, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, MO-153, SOT403-1, TSSOP-16 |
| 文件頁數(shù)： | 13/52頁 |
| 文件大?。?/td> | 382K |
| 代理商： | SC16IS741IPW |
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SC16IS741_1
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 01 — 29 April 2010
13 of 52
NXP Semiconductors
SC16IS741
Single UART with I
2
C-bus/SPI interface, 64-byte FIFOs, IrDA SIR
7.6 Sleep mode
Sleep mode is an enhanced feature of the SC16IS741 UART. It is enabled when EFR[4],
the enhanced functions bit, is set and when IER[4] is set. Sleep mode is entered when:
The serial data input line, RX, is idle (see
Section 7.7 “Break and time-out
conditions”
).
The TX FIFO and TX shift register are empty.
There are no interrupts pending except THR.
Remark:
Sleep mode will
not
be entered if there is data in the RX FIFO.
In Sleep mode, the clock to the UART is stopped. Since most registers are clocked using
these clocks, the power consumption is greatly reduced. The UART will wake up when
any change is detected on the RX line, when there is any change in the state of the
modem input pins, or if data is written to the TX FIFO.
Remark:
Writing to the divisor latches, DLL and DLH, to set the baud clock, must not be
done during Sleep mode. Therefore, it is advisable to disable Sleep mode using IER[4]
before writing to DLL or DLH.
7.7 Break and time-out conditions
When the UART receives a number of characters and these data are not enough to set off
the receive interrupt (because they do not reach the receive trigger level), the UART will
generate a time-out interrupt instead, 4 character times after the last character is
received. The time-out counter will be reset at the center of each stop bit received or each
time the receive FIFO is read.
A break condition is detected when the RX pin is pulled LOW for a duration longer than
the time it takes to send a complete character plus Start, Stop and Parity bits. A break
condition can be sent by setting LCR[6]. When this happens the TX pin will be pulled LOW
until LSR[6] is cleared by the software.
7.8 Programmable baud rate generator
The SC16IS741 UART contains a programmable baud rate 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 10
. The output frequency of the baud rate generator is 16 times the baud rate. The
formula for the divisor is given in
Equation 1
:
(1)
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 10
shows the internal prescaler and baud rate generator circuitry.
divisor
prescaler
desired
baud
rate
-----------------------------------------------------------------------------------
----------------------------------------------------------------------------------------
16
×
=
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| SC16IS741IPW,112 | 功能描述:UART 接口集成電路 IC UART 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 |
| SC16IS741IPW,118 | 功能描述:UART 接口集成電路 SINGLE UART W/ 12C-BUS/SPI INTERFC 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 |
| SC16IS741IPW,128 | 功能描述:UART 接口集成電路 IC UART 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 |
| SC16IS74Q900 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs |
| SC16IS750 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support |
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