參數(shù)資料
型號: SC16C550BIBS
廠商: NXP Semiconductors N.V.
元件分類: 收發(fā)器
英文描述: 5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs
封裝: SC16C550BIA44<SOT187-2 (PLCC44)|<<http://www.nxp.com/packages/SOT187-2.html<1<week 51, 2004,;SC16C550BIA44<SOT187-2 (PLCC44)|<<http://www.nxp.com/packages/SOT187-2.html&l
文件頁數(shù): 12/48頁
文件大?。?/td> 240K
代理商: SC16C550BIBS
SC16C550B_5
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 1 October 2008
12 of 48
NXP Semiconductors
SC16C550B
5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs
6.3.3
Enabling autoflow control and auto-CTS
Autoflow control is enabled by setting MCR[5] and MCR[1].
6.3.4
Auto-CTS and auto-RTS functional timing
The receiver FIFO trigger level can be set to 1, 4, 8, or 14 bytes. These are described in
Figure 8
and
Figure 9
.
Table 5.
MCR[5]
1
1
0
Enabling autoflow control and auto-CTS
MCR[1]
1
0
X
Selection
auto RTS and CTS
auto CTS
disable
(1) When CTS is LOW, the transmitter keeps sending serial data out.
(2) If CTS goes HIGH before the middle of the last stop bit of the current byte, the transmitter finishes sending the current byte, but
it does not send the next byte.
(3) When CTS goes from HIGH to LOW, the transmitter begins sending data again.
Fig 7.
CTS functional timing waveforms
Start
bits 0 to 7
Stop
TX
CTS
002aaa049
Start
bits 0 to 7
Stop
Start
bits 0 to 7
Stop
(1) N = RX FIFO trigger level (1, 4, or 8 bytes).
(2) The two blocks in dashed lines cover the case where an additional byte is sent as described in
Section 6.3.1
.
Fig 8.
RTS functional timing waveforms, RX FIFO trigger level = 1, 4, or 8 bytes
Start
byte N
Start
byte N + 1
Start
byte
Stop
Stop
Stop
RX
RTS
IOR
N
N + 1
1
2
002aaa050
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