Freescale Semiconductor MPC5200B ユーザーズマニュアル

Freescale Semiconductor

15-49

After reset all PSCs are in UART mode. PSC1,2,3 and 6 can be put to one of the Codec modes by writing the appropriate value to the 

register. The other values should be initialized at the same time. During Codec mode the PSC can connect to Codec interfaces with 8, 16, 24 
or 32 bit data. For all these modes the PSC can be programmed to behave as a “normal soft modem” interface, SPI, ESAI or I2S interface. 
The PSC Codec supports for all these modes the master mode (PSC drive the BitClk and FrameSync signal) or slave mode (PSC receive the 
BitClk and FrameSync signals) functionality. Independently from the mode (master or slave) the PSC can provide an Mclk (master clock) for 
an external Codec device. This behavior eliminates the need for an external crystal for the external Codec device. 

 shows a 

simplified block Diagram for the PSC Codec mode. The 

 shows only the PSC signal names for the “normal” 

Codec mode. 

 shows the signal assignment for all PSC Code modes.

The important register to configure the PSC for Codec mode are:

•

 register - select the Codec mode

•

for master mode:
— cdm_pscX_bitclk_config - select Mclk frequency, see 

— cdm_clock_enable_register- enable Mclk, see 

—

- select BitClk and FrameSync Frequency

—

 - select FrameSync width

•

TFALARM

 - select the FIFO “Alarm” level 

•

 register - enable or disable receiver and transmitter

•

Port_config - select the right Pin-Muxing, 

0x0A

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

0xdd00

select the clock source

0x00000000

or

0x08000000

Select the UART mode

0xXX

Select Error Mode, Parity Mode and the Parity Type

0xXX

Select Channel Mode, Port Control and Stop-Bit Length

0x00

set the Baud rate to 9600 with IPB clock frequency 66 MHz

0xD7

0x0XXX

Choose Rx FIFO “almost full” threshold level.

TFALARM

0x0XXX

Choose Tx FIFO “almost empty” threshold level.

0xXXXX

select the desired interrupt

Port_Config

0x00000005

Select the Pin-Muxing for UART mode for PSC1, see 

0x05

Enable Tx and Rx

“normal” Codec

ESAI

TXD

RXD

CLK

FrameSync

I2S

SDATA_out

SDATA_in

SCK

LRCK

SPI Master

MOSI

MISO

SCK

SS

SPI Slave

MISO

MOSI

SCK

SS