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参数资料
| 型号： | SC16C550IB48,128 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1 CHANNEL(S), 3M bps, SERIAL COMM CONTROLLER, PQFP48 |
| 封装： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-313-2, LQFP-48 |
| 文件页数： | 3/52页 |
| 文件大小： | 639K |
| 代理商： | SC16C550IB48,128 |
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Philips Semiconductors
SC16C550
UART with 16-byte FIFO and IrDA encoder/decoder
Product data
Rev. 05 — 19 June 2003
11 of 52
9397 750 11619
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6.3 Autoow control (see Figure 5)
Autoow control is comprised of auto-CTS and auto-RTS. With auto-CTS, the CTS
input must be active before the transmitter FIFO can emit data. With auto-RTS, RTS
becomes active when the receiver needs more data and noties the sending serial
device. When RTS is connected to CTS, data transmission does not occur unless the
receiver FIFO has space for the data; thus, overrun errors are eliminated using
UART 1 and UART 2 from a SC16C550 with the autoow control enabled. If not,
overrun errors occur when the transmit data rate exceeds the receiver FIFO read
latency.
6.3.1
Auto-RTS (see Figure 5)
Auto-RTS data ow control originates in the receiver timing and control block (see
Figure 1 “Block diagram.”) and is linked to the programmed receiver FIFO trigger
level. When the receiver FIFO level reaches a trigger level of 1, 4, or 8 (see Figure 7),
RTS is de-asserted. With trigger levels of 1, 4, and 8, the sending UART may send an
additional byte after the trigger level is reached (assuming the sending UART has
another byte to send) because it may not recognize the de-assertion of RTS until
after it has begun sending the additional byte. RTS is automatically reasserted once
the RX FIFO is emptied by reading the receiver buffer register. When the trigger level
is 14 (see Figure 8), RTS is de-asserted after the rst data bit of the 16th character is
present on the RX line. RTS is reasserted when the RX FIFO has at least one
available byte space.
Table 4:
Flow control mechanism
Selected trigger level
(characters)
INT pin activation
Negate RTS or
send Xoff
Assert RTS or
send Xon
11
4
1
44
8
4
8
12
8
14
10
Fig 5.
Autoow control (auto-RTS and auto-CTS) example.
RCV
FIFO
SERIAL TO
PARALLEL
FLOW
CONTROL
XMT
FIFO
PARALLEL
TO SERIAL
FLOW
CONTROL
PARALLEL
TO SERIAL
FLOW
CONTROL
SERIAL TO
PARALLEL
FLOW
XMT
FIFO
RCV
FIFO
ACE1
ACE2
D7 – D0
RX
TX
RTS
CTS
TX
RX
D7 – D0
CONTROL
002aaa048
CTS
RTS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC16C550IN40 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Universal Asynchronous Receiver/Transmitter (UART) with 16-byte FIFO and infrared (IrDA) encoder/decoder |
| SC16C550IN40,112 | 功能描述:IC UART SINGLE W/FIFO 40-DIP RoHS:是 类别:集成电路 (IC) >> 接口 - UART（通用异步接收器/发送器） 系列:- 标准包装:250 系列:- 特点:* 通道数:2，DUART FIFO's:16 字节 规程:RS232，RS485 电源电压:2.25 V ~ 5.5 V 带并行端口:- 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-TQFP 供应商设备封装:48-TQFP（7x7） 包装:托盘 其它名称:XR16L2551IM-F-ND |
| SC16C554 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Quad UART with 16-byte FIFO and infrared (IrDA) encoder/decoder |
| SC16C554B | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs |
| SC16C554B_10 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs |
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