MAC7200 datasheet(667/976 Pages) FREESCALE

667 / 976 page

Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

589

21–20

PASC[1:0]

After SCK Delay Prescaler. The PASC field selects the prescaler value for the delay between the last edge

of SCK and the negation of PCS. This field is only used in Master Mode. The table below lists the

prescaler values. See the ASC[3:0] field description for details on how to compute the After SCK Delay.

19–18

PDT[1:0]

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[3:0] field description for details on how to compute the Delay after Transfer.

17–16

PBR[1:0]

Baud Rate Prescal. 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[3:0] field description for details on how to

compute the baud rate.

15–12

CSSCK[3:0]

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 30-13 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. 30-2

See Section 30.12.4.2, “PCS to SCK Delay (tCSC),” for more details.

Table 30-10. DSPI_CTARn Field Descriptions (Continued)

Field

Descriptions

PASC

After SCK Delay Prescaler Value

PDT

Delay after Transfer Prescaler Value

PBR

Baud Rate Prescaler Value

CSC

SYS

-----------

PCSSCK

CSSCK

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