
Deserial Serial Peripheral Interface (DSPI)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
20-15
5
CPOL
Clock polarity. Selects the inactive state of the serial communications clock (SCK
x
). This bit is used in both master
and slave mode. For successful communication between serial devices, the devices must have identical clock
polarities. When the continuous selection format is selected (CONT = 1 or DCONT = 1), switching between clock
polarities without stopping the DSPI can cause errors in the transfer due to the peripheral device interpreting the
switch of clock polarity as a valid clock edge. For more information on continuous selection format, see
Section 20.4.7.5, “Continuous Selection Format
.”
0 The inactive state value of SCK
x
is low
1 The inactive state value of SCK
x
is high
6
CPHA
Clock phase. Selects which edge of SCK
x
causes data to change and which edge causes data to be captured. This
bit is used in both master and slave mode. For successful communication between serial devices, the devices must
have identical clock phase settings.
0 Data is
captured
on the leading edge of SCK
x
and
changed
on the following edge
1 Data is
changed
on the leading edge of SCK
x
and
captured
on the following edge
7
LSBFE
LSB first enable. Selects if the LSB or MSB of the frame is transferred first. This bit is only used in master mode.
0 Data is transferred MSB first
1 Data is transferred LSB first
8–9
PCSSCK
[0:1]
PCS
x
to SCK
x
delay prescaler. Selects the prescaler value for the delay between assertion of PCS
x
and the first
edge of the SCK
x
. Use in master mode only. The following table lists the prescaler values. The description for bitfield
CSSCK in
details how to compute the PCS to SCK delay.
10–11
PASC
[0:1]
After SCK
x
delay prescaler. Selects the prescaler value for the delay between the last edge of SCK
x
and the negation
of PCS
x
. Use in master mode only. The following table lists the prescaler values. The description for bitfield ASC in
details how to compute the after SCK
x
delay.
Table 20-5. DSPI
x
_CTAR
n
Field Description (continued)
Field
Description
PCSSCK
Value
PCS
x
to SCK
x
Delay
Prescaler Value
00
1
01
3
10
5
11
7
PASC
Value
After SCK
x
Delay
Prescaler Value
00
1
01
3
10
5
11
7
Summary of Contents for MPC5566
Page 81: ...Introduction MPC5566 Microcontroller Reference Manual Rev 2 1 24 Freescale Semiconductor...
Page 135: ...Signal Description MPC5566 Microcontroller Reference Manual Rev 2 2 54 Freescale Semiconductor...
Page 189: ...Reset MPC5566 Microcontroller Reference Manual Rev 2 4 20 Freescale Semiconductor...
Page 603: ...Flash Memory MPC5566 Microcontroller Reference Manual Rev 2 13 38 Freescale Semiconductor...
Page 609: ...SRAM MPC5566 Microcontroller Reference Manual Rev 2 14 6 Freescale Semiconductor...
Page 1073: ...MPC5566 Microcontroller Reference Manual Rev 2 22 36 Freescale Semiconductor...
Page 1185: ...Nexus MPC5566 Microcontroller Reference Manual Rev 2 25 92 Freescale Semiconductor...