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Deserial Serial Peripheral Interface (DSPI)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
20-59
20.4.7.3
Modified Transfer Format Enabled (MTFE = 1) with
Classic SPI Transfer Format Cleared (CPHA = 0) for SPI and DSI
In the modified transfer format, the master and the slave sample later in the SCK period than in classic SPI
mode to allow for delays in device pads and board traces. These delays become a more significant fraction
of the SCK period as the SCK period decreases with increasing baud rates.
NOTE
For the modified transfer format to operate correctly, you must thoroughly
analyze the SPI link timing budget.
The master and the slave send data to the SOUT
x
pins when the PCS
x
signal asserts. After the PCS
x
to
SCK
x
delay elapses the first SCK
x
edge is generated. The slave samples the master SOUT
x
signal on every
odd numbered SCK
x
edge. The slave also sends more data on the slave SOUT
x
on every odd numbered
clock edge.
The master sends its second data bit to the SOUT
x
pin one system clock after the odd numbered SCK
x
edge. The master samples the slave SOUT
x
pins by writing to the SMPL_PT field in the DSPI
x
_MCR.
lists the number of system clock cycles (between the active-edge of SCK
x
and the master
sample point) for different values of the SMPL_PT bit field. The master sample point can be delayed by
one or two system clock cycles.
Table 20-29. Delayed Master Sample Point
SMPL_PT
Number of System Clock Cycles between
Odd-numbered Edge of SCK and Sampling of SIN
00
0
01
1
10
2
11
Invalid value
Содержание MPC5566
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