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參數(shù)資料
| 型號： | SC16C550B |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs |
| 中文描述： | 5伏，3.3伏和2.5伏的UART具有16字節(jié)的FIFO |
| 文件頁數(shù)： | 11/47頁 |
| 文件大?。?/td> | 229K |
| 代理商： | SC16C550B |
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Philips Semiconductors
SC16C550B
5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs
Product data
Rev. 02 — 14 December 2004
11 of 47
9397 750 14446
Koninklijke Philips Electronics N.V. 2004. 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 SC16C550B 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.
6.3.2
Auto-CTS (see
Figure 5
)
The transmitter circuitry checks CTS before sending the next data byte. When CTS is
active, it sends the next byte. To stop the transmitter from sending the following byte,
CTS must be released before the middle of the last stop bit that is currently being
sent (see
Figure 6
). The auto-CTS function reduces interrupts to the host system.
When flow control is enabled, CTS level changes do not trigger host interrupts
because the device automatically controls its own transmitter. Without auto-CTS, the
transmitter sends any data present in the transmit FIFO and a receiver overrun error
may result.
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 to D0
RX
TX
RTS
CTS
TX
RX
D7 to 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 |
|---|---|
| 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 |
| SC16C550BIA44512 | 制造商:NXP Semiconductors 功能描述:IC SINGLE UART FIFO 3MBPS 5.5V LCC44 |
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