LC89057W-VF4A-E
11. Description of Modulation Function and General-Purpose I/Os
11.1 How to Use Modulation Function
11.1.1 Initial setting
•
The modulation function and general-purpose I/O port function cannot be used simultaneously because they share the
______
same pins. To select the modulation function, pull down INT with a 10kΩ resistor. For further information about the
setting, see Chapter 9.
•
In the initial setting, the modulation function is stopped. To apply the modulation function, set it with TXOPR.
11.1.2 Data output (TMCK, TBCK, TLRCK, TDATA, TXO)
•
Output bi-phase modulated data from TXO by inputting 256fs or 128fs clock into TMCK, 64fs clock into TBCK, fs
clock into TLRCK, audio data into TDATA.
•
Set TCKSEL for clock frequency to input into TMCK. However, the falling edge of TBCK is in synchronization with
the rising edge for TMCK when the TMCK is set at 256fs. Also, the falling edge of TMCK is in synchronization with
the falling edge of TBCK when TMCK is set at 128fs.
•
The polarity of the TLRCK clock is set with TXLRP.
•
Input data can be modulated in the sampling range of 32kHz to 192kHz, in the transfer rate of 4MHz to 25MHz, and
up to 24-bit data.
2
•
The initial value for the input data format is set in I S. Switching to MSB-first right-adjusted input is set with TXDFS.
•
For the channel status, the first 48 bits of data can be written with the microcontroller interface.
•
TXO is fixed to "L" by setting TXOPR to stop or TXMUT.
R-ch
L-ch
TLRCK (I)
TBCK (I)
MSB
LSB
MSB
LSB
TDATA (I)
max. 24bit
max. 24bit
(0): I2S data output
L-ch
R-ch
TLRCK (I)
TBCK (I)
TDATA (I)
MSB
LSB
MSB
LSB
MSB
max. 24bit
max. 24bit
(1): MSB-first front-loading data output
Figure 11.1 Data Input Timing
No.7202-32/59
SANYO [ SANYO SEMICON DEVICE ]
