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| 型号： | SC16C852VIBS,557 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 11/55页 |
| 文件大小： | 0K |
| 描述： | IC UART DUAL W/FIFO 48-HVQFN |
| 标准包装： | 2,450 |
| 特点： | 可编程 |
| 通道数： | 2，DUART |
| FIFO's： | 128 字节 |
| 规程： | RS485 |
| 电源电压： | 2.5V |
| 带自动流量控制功能： | 是 |
| 带IrDA 编码器/解码器： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-HVQFN EP（6x6） |
| 包装： | 托盘 |
| 其它名称： | 935283102557 SC16C852VIBS SC16C852VIBS-ND |
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SC16C852V
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 5 — 21 January 2011
19 of 55
NXP Semiconductors
SC16C852V
Dual UART with 128-byte FIFOs, IrDA, and XScale VLIO bus interface
6.14 RS-485 features
6.14.1 Auto RS-485 RTS control
Normally the RTSx pin is controlled by MCR bit 1, or if hardware flow control is enabled,
the logic state of the RTSx pin is controlled by the hardware flow control circuitry. EFCR2
register bit 4 will take the precedence over the other two modes; once this bit is set, the
transmitter will control the state of the RTSx pin. The transmitter automatically asserts the
RTSx pin (logic 0) once the host writes data to the transmit FIFO, and de-asserts the
RTSx pin (logic 1) once the last bit of the data has been transmitted.
To use the auto RS-485 RTS mode, the software would have to disable the hardware flow
control function.
6.14.2 RS-485 RTS inversion
EFCR2 bit 5 reverses the polarity of the RTSx pin if the UART is in auto RS-485 RTS
mode.
When the transmitter has data to be sent, it will de-assert the RTSx pin (logic 1), and
when the last bit of the data has been sent out, the transmitter asserts the RTS pin
(logic 0).
6.14.3 Auto 9-bit mode (RS-485)
EFCR2 bit 0 is used to enable the 9-bit mode (Multi-drop or RS-485 mode). In this mode
of operation, a ‘master’ station transmits an address character followed by data characters
for the addressed ‘slave’ stations. The slave stations examine the received data and
interrupt the controller if the received character is an address character (parity bit = 1).
To use the auto 9-bit mode the software would have to disable the hardware and software
flow control functions.
6.14.3.1
Normal Multi-drop mode
The 9-bit Mode in EFCR (bit 0) is enabled, but not Special Character Detect (EFR bit 5).
The receiver is set to Force Parity 0 (LCR[5:3] = 111) in order to detect address bytes.
With the receiver initially disabled, it ignores all the data bytes (parity bit = 0) until an
address byte is received (parity bit = 1). This address byte will cause the UART to set the
parity error. The UART will generate a line status interrupt (IER bit 2 must be set to ‘1’ at
this time), and at the same time puts this address byte in the RX FIFO. After the controller
examines the byte it must make a decision whether or not to enable the receiver; it should
enable the receiver if the address byte addresses its ID address, and must not enable the
receiver if the address byte does not address its ID address.
If the controller enables the receiver, the receiver will receive the subsequent data until
being disabled by the controller after the controller has received a complete message
from the ‘master’ station. If the controller does not disable the receiver after receiving a
message from the ‘master’ station, the receiver will generate a parity error upon receiving
another address byte. The controller then determines if the address byte addresses its ID
address, if it is not, the controller then can disable the receiver. If the address byte
addresses the ‘slave’ ID address, the controller take no further action, the receiver will
receive the subsequent data.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC16C852VIBS-G | 功能描述:UART 接口集成电路 1.8V 2CH UART 128B FIFO 5MBPS RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SC16C852VIBS-S | 功能描述:UART 接口集成电路 1.8V 2CH UART 128B FIFO 5MBPS RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SC16C852VIET | 功能描述:UART 接口集成电路 1.8V 2CH UART 128B FIFO 5MBPS RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SC16C852VIET,115 | 功能描述:UART 接口集成电路 1.8V 2CH UART 128B RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SC16C852VIET,118 | 功能描述:UART 接口集成电路 UART 2-CH 128Byte FIFO 1.8V 36-Pin RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
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