6 transmitting and receiving in i2s master mode, Bit cell phone master mode for psc1 -52, Bit cell phone slave mode for psc2 -52 – Freescale Semiconductor MPC5200B User Manual

Page 568: Table 15-82, Table 15-83

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PSC Operation Modes

MPC5200B Users Guide, Rev. 1

Freescale Semiconductor

15-57

15.3.2.6

Transmitting and Receiving in I2S Master Mode

The next support mode is the I2S mode. The I2S transmission is similar to the “Soft Modem” mode. Therefore the configuration is the same
like described in

Section 15.3.2.3, Transmitting and Receiving in “Soft Modem” Codec Mode.

The different is, that during the I2S word

transmission the FrameSync signal (LRCK) is stable for the complete data word and is the opposite for the next one. To enable the I2S mode
the

SICR

[I2S] bit must be set. The

SICR

[SyncPol] bit define if the frame starts with a low LRCK signal or with a high LRCK signal. If the

transmitter detect the start condition he starts to send the data from the TxFIFO. If the receiver detects an start condition, he starts to write the
data from the RX line to the RxFIFO. The FIFO doesn’t provide the ability to mark the data in the FIFO, therefore only the order in the FIFO
define if the data was receive/transmit during high or low phase of the LRCK.

Figure 15-12

shows the I2S transmission diagram.

Table 15-82. 24-Bit Cell Phone Master Mode for PSC1

Register

Value

Setting

0x0A

Disable the Tx and Rx part for configuration if the PSC was enabled by the work
before.

SICR

0x07100000

Select the 24bit Codec mode, msb first, DTS1 = 0, slave mode

RFALARM