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| 型号： | SC16C554DBIB64 |
| 厂商： | NXP Semiconductors N.V. |
| 元件分类： | 收发器 |
| 英文描述： | 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit-s (max.) with 16-byte FIFOs |
| 封装： | SC16C554BIB64<SOT314-2 (LQFP64)|<<http://www.nxp.com/packages/SOT314-2.html<1<week 36, 2004,;SC16C554BIB64<SOT314-2 (LQFP64)|<<http://www.nxp.com/packages/SOT314-2.html&l |
| 文件页数： | 18/58页 |
| 文件大小： | 1035K |
| 代理商： | SC16C554DBIB64 |
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SC16C554B_554DB
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 4 — 8 June 2010
18 of 58
NXP Semiconductors
SC16C554B/554DB
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
6.4 Autoflow control (see
Figure 9
)
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
SC16C554B/554DB with the autoflow control enabled. If not, overrun errors occur when
the transmit data rate exceeds the receiver FIFO read latency.
6.4.1
Auto-RTS (see
Figure 9
)
Auto-RTS data flow control originates in the receiver timing and control block (see block
diagrams in
Figure 1
and
Figure 2
) 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 11
),
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 12
), 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.
Remark:
Auto-RTS is not supported in channel D of the HVQFN48 package, therefore
MCR[5] of channel D should not be written.
6.4.2
Auto-CTS (see
Figure 9
)
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 10
). 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 9.
Autoflow control (auto-RTS and auto-CTS) example
RX
FIFO
FLOW
CONTROL
TX
FIFO
PARALLEL
TO SERIAL
TX
FIFO
RX
FIFO
UART 1
UART 2
D7 to D0
RX
TX
RTS
CTS
TX
RX
CTS
RTS
D7 to D0
002aaa228
SERIAL TO
PARALLEL
SERIAL TO
PARALLEL
FLOW
CONTROL
FLOW
CONTROL
FLOW
CONTROL
PARALLEL
TO SERIAL
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC16C554DBIB64,128 | 功能描述:UART 接口集成电路 16CB 2.5V-5V 4CH UART 16B FIFO 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 |
| SC16C554DBIB64,151 | 功能描述:UART 接口集成电路 4CH. UART 16B FIFO 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 |
| SC16C554DBIB64,157 | 功能描述:UART 接口集成电路 16CB 2.5V-5V 4CH 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 |
| SC16C554DBIB64-S | 功能描述:UART 接口集成电路 4CH. UART 16B FIFO 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 |
| SC16C554DIA68 | 制造商:NXP Semiconductors 功能描述:IC UART QUAD 16BYTE FIFO 16C554 |
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