MPC5604B/C Microcontroller Reference Manual, Rev. 8
Freescale Semiconductor 491
Table 23-20. DSPIx_PUSHR field descriptions
Field Description
CONT Continuous peripheral chip select enable
Selects a continuous selection format. The bit is used in SPI master mode. The bit enables the selected
CS signals to remain asserted between transfers. See Section 23.6.5.5, Continuous selection format,
for more information.
0 Return peripheral chip select signals to their inactive state between transfers
1 Keep peripheral chip select signals asserted between transfers
CTAS Clock and transfer attributes select
Selects which of the DSPIx_CTARs is used to set the transfer attributes for the SPI frame. In SPI slave
mode, DSPIx_CTAR0 is used. The following table shows how the CTAS values map to the
DSPIx_CTARs. There are eight DSPIx_CTARs in the device DSPI implementation.
Note: Use in SPI master mode only.
EOQ End of queue
Provides a means for host software to signal to the DSPI that the current SPI transfer is the last in a
queue. At the end of the transfer the EOQF bit in the DSPIx_SR is set.
0 The SPI data is not the last data to transfer
1 The SPI data is the last data to transfer
Note: Use in SPI master mode only.
CTCNT Clear SPI_TCNT
Provides a means for host software to clear the SPI transfer counter. The CTCNT bit clears the
SPI_TCNT field in the DSPIx_TCR. The SPI_TCNT field is cleared before transmission of the current
SPI frame begins.
0 Do not clear SPI_TCNT field in the DSPIx_TCR
1 Clear SPI_TCNT field in the DSPIx_TCR
Note: Use in SPI master mode only.
CTAS
Use clock and transfer
attributes from
000 DSPIx_CTAR0
001 DSPIx_CTAR1
010 DSPIx_CTAR2
011 DSPIx_CTAR3
100 DSPIx_CTAR4
101 DSPIx_CTAR5
110 Reserved
111 Reserved
To Next Page
Loading...
