參數(shù)資料
型號(hào)： SC16C2550BIA44
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 dual UART, 5 Mbit-s (max.), with 16-byte FIFOs
封裝： SC16C2550BIA44<SOT187-2 (PLCC44)|<<http://www.nxp.com/packages/SOT187-2.html<1<week 51, 2004,;SC16C2550BIA44<SOT187-2 (PLCC44)|<<http://www.nxp.com/packages/SOT187-2.html
文件頁(yè)數(shù)： 21/43頁(yè)
文件大?。?/td> 211K
代理商： SC16C2550BIA44
SC16C2550B_5
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 12 January 2009
21 of 43
NXP Semiconductors
SC16C2550B
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs
7.6 Modem Control Register (MCR)
This register controls the interface with the modem or a peripheral device.
Table 16.
LCR[2]
0
1
1
LCR[2] stop bit length
Word length (bits)
5, 6, 7, 8
5
6, 7, 8
Stop bit length (bit times)
1
1
1
2
2
Table 17.
LCR[1]
0
0
1
1
LCR[1:0] word length
LCR[0]
0
1
0
1
Word length (bits)
5
6
7
8
Table 18.
Bit
7:5
4
Modem Control Register bits description
Symbol
Description
MCR[7:5]
reserved; set to ‘0’
MCR[4]
Loopback. Enable the local Loopback mode (diagnostics). In this mode the
transmitter output (TX) and the receiver input (RX), CTS, DSR, CD and RI
are disconnected from the SC16C2550B I/O pins. Internally the modem
data and control pins are connected into a loopback data configuration
(see
Figure 7
). In this mode, the receiver and transmitter interrupts remain
fully operational. The Modem Control Interrupts are also operational, but
the interrupts’ sources are switched to the lower four bits of the Modem
Control. Interrupts continue to be controlled by the IER register.
logic 0 = disable Loopback mode (normal default condition)
logic 1 = enable local Loopback mode (diagnostics)
MCR[3]
OP2/INT enable
logic 0 = forces INT (A, B) outputs to the 3-state mode and sets OP2 to a
logic 1 (normal default condition)
logic 1 = forces the INT (A, B outputs to the active mode and sets OP2 to
a logic 0
MCR[2]
(OP1). OP1A/OP1B are not available as an external signal in the
SC16C2550B. This bit is instead used in the Loopback mode only. In the
Loopback mode, this bit is used to write the state of the modem RI
interface signal.
MCR[1]
RTS
logic 0 = force RTS output to a logic 1 (normal default condition)
logic 1 = force RTS output to a logic 0
MCR[0]
DTR
logic 0 = force DTR output to a logic 1 (normal default condition)
logic 1 = force DTR output to a logic 0
3
2
1
0
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