參數(shù)資料
型號： SC16C550IB48,128
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 1 CHANNEL(S), 3M bps, SERIAL COMM CONTROLLER, PQFP48
封裝： 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-313-2, LQFP-48
文件頁數(shù)： 3/52頁
文件大?。?/td> 639K
代理商： SC16C550IB48,128
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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