sc16c852viet NXP Semiconductors, sc16c852viet Datasheet - Page 29

• Manufacturer Part Number: sc16c852viet
• Description: Sc16c852v 1.8 V Dual Uart, 5 Mbit/s Max. With 128-byte Fifos, Infrared Irda , And Xscale Vlio Bus Interface
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SC16C852V_4
Product data sheet
7.6 Modem Control Register (MCR)
This register controls the interface with the modem or a peripheral device.
Table 20.
Table 21.
Bit
7
6
5
4
3
2
1
0
MCR[3]
0
1
Symbol Description
MCR[7] Clock select
MCR[6] IR enable (see
MCR[5] Reserved; set to ‘0’.
MCR[4] Loopback. Enable the local Loopback mode (diagnostics). In this mode the
MCR[3] OP2A/OP2B, INT enable
MCR[2]
MCR[1] RTS
MCR[0] DTR
Modem Control Register bits description
Interrupt output control
transmitter output (TX) and the receiver input (RX), CTS, DSR, CD, and RI are
disconnected from the SC16C852V I/O pins. Internally the modem data and
control pins are connected into a loopback data configuration (see
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.
Remark: OP2A/OP2B pins do not exist on the TFBGA36 package.
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.
OP1A/OP1B are not available as an external signal in the SC16C852V. This bit is
Dual UART with 128-byte FIFOs, IrDA, and XScale VLIO bus interface
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 = forces INT (A, B) outputs to the 3-state mode and sets OP2A/OP2B to
a logic 1 (normal default condition)
logic 1 = forces the INT (A, B) outputs to the active mode and sets OP2A/OP2B
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
INT (A, B) output
3-state
active
Rev. 04 — 14 January 2008
Figure
21).
SC16C852V
© NXP B.V. 2008. All rights reserved.
Figure
9). In
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