參數(shù)資料
型號： SC16C550
廠商： NXP Semiconductors N.V.
英文描述： Universal Asynchronous Receiver/Transmitter (UART) with 16-byte FIFO and infrared (IrDA) encoder/decoder
中文描述： 通用異步接收器/發(fā)送器（UART），16字節(jié)FIFO和紅外線（IrDA）編碼器/解碼器
文件頁數(shù)： 11/52頁
文件大?。?/td> 639K
代理商： SC16C550
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 Autoflow control (see
Figure 5
)
Autoflow 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 notifies 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 autoflow 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 flow 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 first 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:
Selected trigger level
(characters)
1
4
8
14
Flow control mechanism
INT pin activation
Negate RTS or
send Xoff
4
8
12
14
Assert RTS or
send Xon
1
4
8
10
1
4
8
14
Fig 5.
Autoflow 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
CONTROL
XMT
FIFO
RCV
FIFO
ACE1
ACE2
D7 – D0
RX
TX
RTS
CTS
TX
RX
D7 – D0
002aaa048
CTS
RTS
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC16C550B 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs
SC16C550BIA44 功能描述:UART 接口集成電路 16CB 2.5V-5V 1CH UART 16B 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
SC16C550BIA44,512 功能描述:UART 接口集成電路 16CB 2.5V-5V 1CH 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
SC16C550BIA44,518 功能描述:UART 接口集成電路 1CH. UART 16B 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
SC16C550BIA44,529 功能描述:UART 接口集成電路 16CB 2.5V-5V 1CH 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
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