參數(shù)資料
型號(hào)： 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(yè)數(shù)： 5/52頁(yè)
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
13 of 52
9397 750 11619
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6.4 Software ow control
When software ow control is enabled, the SC16C550 compares one or two
sequential receive data characters with the programmed Xon or Xoff character
value(s). If receive character(s) (RX) match the programmed values, the SC16C550
will halt transmission (TX) as soon as the current character(s) has completed
transmission. When a match occurs, the receive ready (if enabled via Xoff IER[5])
ags will be set and the interrupt output pin (if receive interrupt is enabled) will be
activated. Following a suspension due to a match of the Xoff characters’ values, the
SC16C550 will monitor the receive data stream for a match to the Xon1,2 character
value(s). If a match is found, the SC16C550 will resume operation and clear the ags
(ISR[4]).
Reset initially sets the contents of the Xon/Xoff 8-bit ow control registers to a logic 0.
Following reset, the user can write any Xon/Xoff value desired for software ow
control. Different conditions can be set to detect Xon/Xoff characters and
suspend/resume transmissions. When double 8-bit Xon/Xoff characters are selected,
the SC16C550 compares two consecutive receive characters with two software ow
control 8-bit values (Xon1, Xon2, Xoff1, Xoff2) and controls TX transmissions
accordingly. Under the above described ow control mechanisms, ow control
characters are not placed (stacked) in the user accessible RX data buffer or FIFO.
When using a software ow control the Xon/Xoff characters cannot be used for data
transfer.
In the event that the receive buffer is overlling and ow control needs to be executed,
the SC16C550 automatically sends an Xoff message (when enabled) via the serial
TX output to the remote modem. The SC16C550 sends the Xoff1,2 characters as
soon as received data passes the programmed trigger level. To clear this condition,
the SC16C550 will transmit the programmed Xon1,2 characters as soon as receive
data drops below the programmed trigger level.
(1) RTS is de-asserted when the receiver receives the rst data bit of the sixteenth byte. The receive FIFO is full after nishing
the sixteenth byte.
(2) RTS is asserted again when there is at least one byte of space available and no incoming byte is in processing, or there is
more than one byte of space available.
(3) When the receive FIFO is full, the rst receive buffer register read re-asserts RTS.
Fig 8.
RTS functional timing waveforms, RCV FIFO trigger level = 14 bytes.
BYTE 14
BYTE 15
RX
RTS
IOR
(RD RBR)
START
BYTE 18
STOP
START
BYTE 16
STOP
RTS RELEASED AFTER THE
FIRST DATA BIT OF BYTE 16
002aaa051
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