sc16is850l NXP Semiconductors, sc16is850l Datasheet - Page 26

• Manufacturer Part Number: sc16is850l
• Description: Single Uart With I2c-bus/spi Interface, 128 Bytes Of Transmit And Receive Fifos, Irda Sir Built-in Support
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SC16IS850L
Product data sheet
8.6 Modem Control Register (MCR)
Table 16.
This register controls the interface with the modem or a peripheral device.
Table 17.
LCR[1]
0
0
1
1
Bit
7
6
5
4
3
2
1
0
Symbol
MCR[7]
MCR[6]
MCR[5]
MCR[4]
MCR[3]
MCR[2]
MCR[1]
MCR[0]
LCR[1:0] word length
Modem Control Register bits description
LCR[0]
0
1
0
1
All information provided in this document is subject to legal disclaimers.
Description
Clock select
IR enable (see
Reserved.
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 SC16IS850L I/O pins. Internally the modem data
and control pins are connected into a loopback data configuration (see
Figure
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. This bit is used for internal Loopback mode only. In Loopback mode,
this bit is used to write the state of the modem CD interface signal.
OP1. This bit is used for internal Loopback mode only. In Loopback mode,
this bit is used to write the state of the modem RI interface signal.
RTS
DTR
logic 0 = divide-by-1 clock input
logic 1 = divide-by-4 clock input
logic 0 = enable the standard modem receive and transmit input/output
interface (normal default condition)
logic 1 = enable infrared IrDA receive and transmit inputs/outputs. While
in this mode, the TX/RX output/inputs are routed to the infrared
encoder/decoder. The data input and output levels will conform to the
IrDA infrared interface requirement. As such, while in this mode, the
infrared TX output will be a logic 0 during idle data conditions.
logic 0 = disable Loopback mode (normal default condition)
logic 1 = enable local Loopback mode (diagnostics)
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
Rev. 1 — 22 July 2011
8). In this mode, the receiver and transmitter interrupts remain fully
Word length (bits)
5
6
7
8
Figure
31).
Single UART with I
SC16IS850L
2
C-bus/SPI interface
© NXP B.V. 2011. All rights reserved.
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