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Deserial Serial Peripheral Interface (DSPI)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
20-55
shows the timing of the PCSS signal relative to PCS signals.
Figure 20-33. Peripheral Chip Select Strobe Timing
The delay between the assertion of the PCS
x
signals and the assertion of PCSS is selected by the PCSSCK
field in the DSPI
x
_CTAR based on the following formula:
At the end of the transfer the delay between PCSS negation and PCS
x
negation is selected by the PASC
field in the DSPI
x
_CTAR based on the following formula:
shows an example of the computed t
PCSSCK
delay.
shows an example of the computed the t
PASC
delay.
20.4.7
Transfer Formats
The SPI serial communication is controlled by the serial communications clock (SCK
x
) signal and the
PCS
x
signals. The SCK
x
signal provided by the master device synchronizes shifting and sampling of the
data by the SIN
x
and SOUT
x
pins. The PCS
x
signals serve as enable signals for the slave devices.
When the DSPI is the bus master, the CPOL and CPHA bits in the DSPI clock and transfer attributes
registers (DSPI
x
_CTAR
n
) select the polarity and phase of the serial clock, SCK
x
. The polarity bit selects
the idle state of the SCK
x
. The clock phase bit selects if the data on SOUT
x
is valid before or on the first
SCK
x
edge.
Table 20-27. Peripheral Chip Select Strobe Assert Computation Example
PCSSCK
Prescaler
f
SYS
Delay before Transfer
0b11
7
100 MHz
70.0 ns
Table 20-28. Peripheral Chip Select Strobe Negate Computation Example
PASC
Prescaler
f
SYS
Delay after Transfer
0b11
7
100 MHz
70.0 ns
PCSS
PCSx
t
PCSSCK
t
PASC
tPCSSCK =
PCSSCK
×
f
SYS
1
tPASC =
PASC
×
f
SYS
1
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