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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
20-24
Freescale Semiconductor
Table 20-8. DSPIx_PUSHR Field Descriptions
Bits
Name
Description
0
CONT
Continuous peripheral chip select enable.Selects a continuous selection format. The bit
is used in SPI master mode. The bit enables the selected PCS signals to remain
asserted between transfers. See
Section 20.4.7.5, “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
1–3
CTAS
[0:2]
Clock and transfer attributes select. Selects which of the DSPIx_CTARs is used to set
the transfer attributes for the associated SPI frame. In SPI slave mode DSPIx_CTAR0 is
used. The table below shows how the CTAS values map to the DSPIx_CTARs. There are
eight DSPIx_CTARs in the MPC5553/MPC5554 DSPI implementation.
Note: The field is only used in SPI master mode.
4
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: This bitfield is used only in SPI master mode
5
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: This bitfield is used only in SPI master mode
6–7
—
Reserved.
8–9
—
Reserved, but implemented. These bits are writable, but have no effect.
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
DSPIx_CTAR6
111
DSPIx_CTAR7
Summary of Contents for MPC5553
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