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Chapter 26 Deserial Serial Peripheral Interface (DSPI)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
603
.
Offsets: 0x0C–0x20 (6 registers)
Access: Read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
DBR
FMSZ
CPOL
CPHA
LSBFE
PCSSCK
PASC
PDT
PBR
W
Reset
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
CSSCK
ASC
DT
BR
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 26-5. DSPI Clock and Transfer Attributes Registers 0–5 (DSPI
x
_CTARn)
Table 26-5. DSPI
x
_CTAR
n
field descriptions
Field
Descriptions
DBR
Double Baud Rate
The DBR bit doubles the effective baud rate of the Serial Communications Clock (SCK). This field is only
used in Master Mode. It effectively halves the Baud Rate division ratio supporting faster frequencies and
odd division ratios for the Serial Communications Clock (SCK). When the DBR bit is set, the duty cycle
of the Serial Communications Clock (SCK) depends on the value in the Baud Rate Prescaler and the
Clock Phase bit as listed in
. See the BR[0:3] field description for details on how to compute
the baud rate. If the overall baud rate is divide by two or divide by three of the system clock then neither
the Continuous SCK Enable or the Modified Timing Format Enable bits should be set.
0 The baud rate is computed normally with a 50/50 duty cycle
1 The baud rate is doubled with the duty cycle depending on the Baud Rate Prescaler
FMSZ
Frame Size
The FMSZ field selects the number of bits transferred per frame. The FMSZ field is used in Master Mode
and Slave Mode.
lists the frame size encodings.
CPOL
Clock Polarity
The CPOL bit selects the inactive state of the Serial Communications Clock (SCK). 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, 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.
0 The inactive state value of SCK is low
1 The inactive state value of SCK is high
CPHA
Clock Phase
The CPHA bit selects which edge of SCK 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. Continuous SCK is only
supported for CPHA = 1.
0 Data is captured on the leading edge of SCK and changed on the following edge
1 Data is changed on the leading edge of SCK and captured on the following edge
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