XR16C872IQ View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XR16C872IQ' PDF : 60 Pages View PDF
Preliminary
XR16C872
LCR BIT-5 = logic 1 and LCR BIT-4 = logic 1, parity bit
is forced to a logical 0 for the transmit and receive data.
LCR
Bit-3
LCR
Bit-4
LCR
Bit-5
Parity Selection
0
X
X
No parity
1
0
0
Odd parity
1
1
0
Even parity
1
0
1
Forced parity=“1”
1
1
1
Forced parity= 0”
LCR BIT-6:
When enabled the Break control bit causes a break
condition to be transmitted (the TX output is forced to
a logic 0 state). This condition exists until disabled by
setting LCR bit-6 to a logic 0.
Logic 0 = No TX break condition. (normal default
condition)
Logic 1 = Forces the transmitter output (TX) to a logic
0 for alerting the remote receiver to a line break
condition.
LCR BIT-7:
The internal baud rate counter latch and Enhance
Feature mode enable.
Logic 0 = Divisor latch disabled. (normal default condi-
tion)
Logic 1 = Select baud rate divisors (DLL and DLM) and
enhanced feature register set enabled
Modem Control Register (MCR)
This register controls the interface with the modem or
a peripheral device.
MCR BIT-0:
Logic 0 = Force -DTR output to a logic 1. (normal
default condition)
Logic 1 = Force -DTR output to a logic 0.
MCR BIT-1:
Logic 0 = Force RTS# output to a logic 1. (normal
default condition)
Logic 1 = Force RTS# output to a logic 0.
Automatic RTS may be used for hardware flow control
by enabling EFR bit-6 (See EFR bit-6).
MCR BIT-2:
*OP1# output is not available in the 872.
Logic 0 = Set OP1# output to a logic 1. (normal default
condition)
Logic 1 = Set OP1# output to a logic 0.
MCR BIT-3:
*OP2# output is not available in the 872
Logic 0 = Set OP2# output to a logic 1. (normal default
condition)
Logic 1 = Set OP2# output to a logic 0.
MCR BIT-4:
Logic 0 = Disable loop-back mode. (normal default
condition)
Logic 1 = Enable local loop-back mode (diagnostics).
MCR BIT-5:
Logic 0 = Disable Xon-Any function (normal default
condition)
Logic 1 = Enable Xon-Any function. In this mode any
RX character received will enable Xon.
MCR BIT-6:
Logic 0 = Enable 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. Care must be taken into consideration
in the design not to over heat the IR LED during power
up initialization state while TX output is still at logic 1.
Rev. P1.00
33
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