SC16C2550BIA44,512 NXP Semiconductors, SC16C2550BIA44,512 Datasheet - Page 21

• Manufacturer Part Number: SC16C2550BIA44,512
• Description: IC UART DUAL W/FIFO 44-PLCC
• Manufacturer: NXP Semiconductors

Specifications of SC16C2550BIA44,512

• Features: False-start Bit Detection
• Number Of Channels: 2, DUART
• Fifo's: 16 Byte
• Voltage - Supply: 3.5 V ~ 4.5 V
• With Auto Flow Control: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• With Cmos: Yes
• Mounting Type: Surface Mount
• Package / Case: 44-LCC (J-Lead)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935274407512; SC16C2550BIA44; SC16C2550BIA44

NXP Semiconductors
SC16C2550B_5
Product data sheet
7.6 Modem Control Register (MCR)
Table 16.
Table 17.
This register controls the interface with the modem or a peripheral device.
Table 18.
LCR[2]
0
1
1
LCR[1]
0
0
1
1
Bit
7:5
4
3
2
1
0
Symbol
MCR[7:5]
MCR[4]
MCR[3]
MCR[2]
MCR[1]
MCR[0]
LCR[2] stop bit length
LCR[1:0] word length
Modem Control Register bits description
Word length (bits)
5, 6, 7, 8
5
6, 7, 8
LCR[0]
0
1
0
1
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs
Description
reserved; set to ‘0’
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
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.
OP2/INT enable
(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.
RTS
DTR
Rev. 05 — 12 January 2009
logic 0 = disable Loopback mode (normal default condition)
logic 1 = enable local Loopback mode (diagnostics)
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
logic 0 = force RTS output to a logic 1 (normal default condition)
logic 1 = force RTS output to a logic 0
logic 0 = force DTR output to a logic 1 (normal default condition)
logic 1 = force DTR output to a logic 0
Word length (bits)
5
6
7
8
Figure
7). In this mode, the receiver and transmitter interrupts remain
Stop bit length (bit times)
1
1
2
1
2
SC16C2550B
© NXP B.V. 2009. All rights reserved.
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