MPC5604B/C Microcontroller Reference Manual, Rev. 8
Freescale Semiconductor 481
PDT Delay after Transfer Prescaler
The PDT field selects the prescaler value for the delay 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. The PDT field is only used
in Master Mode. The table below lists the prescaler values. See the DT[0:3] field description for details
on how to compute the delay after transfer.
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.
Table 23-14 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. 23-1
See Section 23.6.4.2, 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. Table 23-15
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. 23-2
See Section 23.6.4.3, After SCK delay (tASC),” for more details.
Table 23-5. DSPIx_CTARn field descriptions (continued)
Field Descriptions
PDT Delay after transfer prescaler value
00 1
01 3
10 5
11 7
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=
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