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Chapter 26 Deserial Serial Peripheral Interface (DSPI)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
605
PBR
Baud Rate Prescaler
The PBR field selects the prescaler value for the baud rate. This field is only used in Master Mode. The
Baud Rate is the frequency of the Serial Communications Clock (SCK). The system clock is divided by
the prescaler value before the baud rate selection takes place. The Baud Rate Prescaler values are
listed in the table below. See the BR[0:3] field description for details on how to compute the baud rate.
CSSCK
PCS to SCK Delay Scaler
The CSSCK field selects the scaler value for the PCS to SCK delay. This field is only used in Master
Mode. The PCS to SCK Delay is the delay between the assertion of PCS and the first edge of the SCK.
list the scaler values.The PCS to SCK Delay is a multiple of the system clock period and it
is computed according to the following equation:
Eqn. 26-1
Section 26.6.4.2, CS to SCK delay (tCSC)
, for more details.
ASC
After SCK Delay Scaler
The ASC field selects the scaler value for the After SCK Delay. This field is only used in Master Mode.
The After SCK Delay is the delay between the last edge of SCK and the negation of PCS.
lists the scaler values.The After SCK Delay is a multiple of the system clock period, and it is computed
according to the following equation:
Eqn. 26-2
Section 26.6.4.3, After SCK delay (tASC)
, for more details.
DT
Delay after Transfer Scaler
The DT field selects the Delay after Transfer Scaler. This field is only used in Master Mode. The Delay
after Transfer is the time between the negation of the PCS signal at the end of a frame and the assertion
of PCS at the beginning of the next frame.
lists the scaler values. In the Continuous Serial
Communications Clock operation the DT value is fixed to one TSCK. The Delay after Transfer is a
multiple of the system clock period and it is computed according to the following equation:
Eqn. 26-3
Section 26.6.4.4, Delay after transfer (tDT)
, for more details.
Table 26-5. DSPI
x
_CTAR
n
field descriptions (continued)
Field
Descriptions
PBR
Baud rate prescaler value
00
2
01
3
10
5
11
7
t
CSC
1
f
SYS
-----------
PCSSCK
CSSCK
=
t
ASC
1
f
SYS
-----------
PASC
ASC
=
t
DT
1
f
SYS
-----------
PDT
DT
=
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