Deserial Serial Peripheral Interface (DSPI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
19-24
Freescale Semiconductor
The following table describes the fields in the DSPI push transmit FIFO register:
Table 19-8. DSPI
x
_PUSHR Field Descriptions
Field
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. Refer to
,” 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 DSPI
x
_CTARs is used to set the transfer attributes for the
SPI frame. In SPI slave mode, DSPI
x
_CTAR0 is used. The following table shows how the CTAS values map to the
DSPI
x
_CTARs. There are eight DSPI
x
_CTARs in the device DSPI implementation.
Note:
Use in SPI master mode only.
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 DSPI
x
_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.
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 DSPI
x
_TCR. The SPI_TCNT field is cleared before transmission of the current SPI frame
begins.
0 Do not clear SPI_TCNT field in the DSPI
x
_TCR
1 Clear SPI_TCNT field in the DSPI
x
_TCR
Note:
Use in SPI master mode only.
6–7
Reserved.
8–9
Reserved, but implemented. These bits are writable, but have no effect.
CTAS
Use Clock and Transfer
Attributes from
000
DSPI
x
_CTAR0
001
DSPI
x
_CTAR1
010
DSPI
x
_CTAR2
011
DSPI
x
_CTAR3
100
DSPI
x
_CTAR4
101
DSPI
x
_CTAR5
110
DSPI
x
_CTAR6
111
DSPI
x
_CTAR7
Содержание MPC5565
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