CHAPTER 24:Inter-IC Sound (I2S)
930
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
[bit31:26] CKRT : Clock Divider
This sets output clock frequency dividing ratio at master operation.
Internal clock is divided at I2Sn_CNTREG:ECKM = "0", and external clock (ECLK) is divided at
I2Sn_CNTREG:ECKM = "1". Only even number of the ratio is supported and output clock's duty
becomes 50%.
Bit
Description
000000
Output clock is not divided
000001
Output clock is divided by 2
000010
Output clock is divided by 4
000011
Output clock is divided by 6
...
...
111110
Output clock is divided by 124
111111
Output clock is divided by 126
[bit25:16] OVHD : Frame Rate Control
Frame rate can be adjusted by inserting overhead (OVHD) bits following the valid data of the frame.
The overhead section of the transmission frame enters the state of high impedance. Up to 1023
overhead bits can be inserted at the end of the frame.
The value set to OVHD becomes the number of insertion bits.
The following expressions are formed for OVHD and frame synchronous signal cycle.
1 sub frame construction:
−
OVHD = Frame synchronous signal cycle/SCK cycle - (I2Sn_MCR0REG:S0CHL + 1) *
(I2Sn_MCR0REG:S0CHN + 1)
2 sub frame construction:
−
OVHD = Frame synchronous signal cycle/SCK cycle - (I2Sn_MCR0REG:S0CHL + 1) *
(I2Sn_MCR0REG:S0CHN + 1) - (I2Sn_MCR0REG:S1CHL + 1) * (I2Sn_MCR0REG:S1CHN + 1)
[bit15] read0 : -
[bit14] MSKB : Serial Output Data in case of Invalid/Empty Frame Transmission
For master operation (I2Sn_CNTREG:MSMD = "1"), free-running mode (I2Sn_CNTREG:FRUN = "0"),
and I2Sn_OPRREG:TXENB = "1":
−
When transmission FIFO is empty at frame synchronous signal output, MSKB is output to all valid
channels of its transmission frame.
For slave operation (I2Sn_CNTREG:MSMD = "0") and I2Sn_OPRREG:TXENB = "1":
−
When transmission FIFO is empty at frame synchronous signal reception, MSKB is output to all
valid channels of its transmission frame.
For the case that transmission word length is shorter than the channel length, MSKB is driven to the
rest of bit in transmission channel (channel length - word length).
Содержание S6J3200 Series
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