UART Registers
19.5.1.52 Mode Definition Register 3 (MDR3) Register
The DISABLE_CIR_RX_DEMOD register bit will force the CIR receiver to bypass demodulation of
received data if set. See the CIR Mode Block Components. The NONDEFAULT_FREQ register bit allows
the user to set sample per bit by writing it into FREQ_SEL register. Set it if non-default (48 MHz) fclk
frequency is used to achieve a less than 2% error rate. Changing this bit (to any value) will automatically
disable the device by setting MDR[2:0] to “111”.
The Mode Definition Register 3 (MDR3) register is shown in
and described in
Figure 19-85. Mode Definition Register 3 (MDR3) Register
31
3
2
1
0
Reserved
SET_DMA_TX_ NONDEFAULT
DISABLE_CIR_
THRESHOLD
_FREQ
RX_DEMOD
R-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 19-84. Mode Definition Register 3 (MDR3) Register Field Descriptions
Bit
Field
Value
Description
31-3
Reserved
0
Reserved.
2
SET_DMA_TX_T
0
Disable use of TX DMA Threshold register. Use 64-TX trigger as DMA threshold.
HRESHOLD
1
Enable to set different TX DMA threshold in the TX DMA Threshold register.
1
NONDEFAULT_F
0
Disables using NONDEFAULT fclk frequencies
REQ
1
Enables using NONDEFAULT fclk frequencies (set FREQ_SEL and DLH/DLL)
0
DISABLE_CIR_R
0
Enables CIR RX demodulation
X_DEMOD
1
Disables CIR RX demodulation
3548
Universal Asynchronous Receiver/Transmitter (UART)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated