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.

Table15-82. 24-Bit Cell Phone Master Mode for PSC1

Register Value Setting
CR 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 0x000C set the RFALARM level to 0x00C
TFALARM 0x0010 set the TFALARM level to 0x010
IMR 0x0100 enable TxRDY interrupt
Port_Config 0x00000066 Select the Pin-Muxing for PSC1,PSC2 Codec mode, see Chapter 2, Signal
Descriptions
CR 0x05 Enable Tx and Rx

Table15-83. 24-Bit Cell Phone Slave Mode for PSC2

Register Value Setting
CR 0x0A Disable the Tx and Rx part for configuration if the PSC was enabled by the work
before.
SICR 0x07980000 Select the 24bit Codec mode, msb first, DTS1 = 0, master mode, cell phone
master
CCR 0x01170000 select the BitClk and Frame frequency
CTUR 0x00 select the FrameSync width, default value
RFALARM 0x000C set the RFALARM level to 0x00C
TFALARM 0x0010 set the TFALARM level to 0x010
IMR 0x0100 enable TxRDY interrupt
Port_Config 0x00000066 Select the Pin-Muxing for PSC12, PSC2 Codec mode, see Chapter 2, Signal
Descriptions
CR 0x05 Enable Tx and Rx