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Chapter 26 Deserial Serial Peripheral Interface (DSPI)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
601
26.5.3
DSPI Transfer Count Register (DSPI
x
_TCR)
The DSPI
x
_TCR contains a counter that indicates the number of SPI transfers made. The transfer counter
is intended to assist in queue management. The user must not write to the DSPI
x
_TCR while the DSPI is
running.
DIS_RXF
Disable receive FIFO
Enables and disables the RX FIFO. When the RX FIFO is disabled, the receive part of the DSPI
operates as a simplified double-buffered SPI. See
Section 26.6.3.3, FIFO disable operation
for
details.
0 RX FIFO is enabled
1 RX FIFO is disabled
CLR_TXF
Clear TX FIFO. CLR_TXF is used to flush the TX FIFO. Writing a 1 to CLR_TXF clears the TX FIFO
Counter. The CLR_TXF bit is always read as zero.
0 Do not clear the TX FIFO Counter
1 Clear the TX FIFO Counter
CLR_RXF
Clear RX FIFO. CLR_RXF is used to flush the RX FIFO. Writing a 1 to CLR_RXF clears the RX
Counter. The CLR_RXF bit is always read as zero.
0 Do not clear the RX FIFO Counter
1 Clear the RX FIFO Counter
SMPL_PT
Sample point
Allows the host software to select when the DSPI master samples SIN in modified transfer format.
shows where the master can sample the SIN pin. The following table lists the delayed
sample points.
HALT
Halt
Provides a mechanism for software to start and stop DSPI transfers. See
, for details on the operation of this bit.
0 Start transfers
1 Stop transfers
Table 26-3. DSPI
x
_MCR field descriptions (continued)
Field
Description
SMPL_PT
Number of system clock cycles between
odd-numbered edge of SCK_
x
and sampling of SIN_
x
00
0
01
1
10
2
11
Reserved
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