Datasheet

816
32117D–AVR-01/12
AT32UC3C
• TDMFS: TDM Frame Sync
• NBCHAN: Number of TDM Channels - 1
This field should be written with the number of TDM channels minus one
• TXSAME: Transmit Data when Underrun
0: Zero sample transmitted when underrun
1: Previous sample transmitted when underrun (in I2S mode only)
• TXDMA: Single or multiple DMA Channels for Transmitter
0: Transmitter uses a single DMA channel for all
audio channels
1: Transmitter uses one DMA channel per audio channel
• TXMONO: Transmit Mono
0: Stereo
1: Mono, with left audio samples duplicated to right audio channel by the IISC
• RXLOOP: Loop-back Test Mode
0: Normal mode
1: ISDO output of IISC is internally connected to ISDI input
• RXMONO: Receive Mono
0: Stereo
1: Mono, with left audio samples duplicated to right audio channel by the IISC
• RXDMA: Single or multiple DMA Channels for Receiver
0: Receiver uses a single DMA channel for all audio channels
1: Receiver uses one DMA channel per audio channel-
256 fs 15 7 - 3
384 fs 23 11 7 5
512 fs 31 15 - 7
768 fs 47 23 15 11
1024 fs 63 31 - 15
Table 30-5. TDM Frame Sync
TDMFS Description
0 SLOT IWS pulse is high for one time slot at beginning of frame
1 HALF IWS pulse is high for half the time slots at beginning of frame, i.e. half the IWS period
3 BIT IWS pulse is high for one bit period at beginning of frame, i.e. one ISCK period
3- Reserved
Table 30-4. Master Clock to Sampling Frequency (fs) Ratio
fs Ratio
IMCKFS
2 channels 4 channels 6 channels 8 channels