SPIx_CTARn field descriptions (continued)
Field
Description
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.
See the DT field description for details on how to compute the Delay after Transfer. Refer
00
Delay after Transfer Prescaler value is 1.
01
Delay after Transfer Prescaler value is 3.
10
Delay after Transfer Prescaler value is 5.
11
Delay after Transfer Prescaler value is 7.
17–16
PBR
Baud Rate Prescaler
Selects the prescaler value for the baud rate. This field is used only in master mode. The baud rate is the
frequency of the SCK. The system clock is divided by the prescaler value before the baud rate selection
takes place. See the BR field description for details on how to compute the baud rate.
00
Baud Rate Prescaler value is 2.
01
Baud Rate Prescaler value is 3.
10
Baud Rate Prescaler value is 5.
11
Baud Rate Prescaler value is 7.
15–12
CSSCK
PCS to SCK Delay Scaler
Selects the scaler value for the PCS to SCK delay. This field is used only in master mode. The PCS to
SCK Delay is the delay between the assertion of PCS and the first edge of the SCK. The delay is a
multiple of the system clock period, and it is computed according to the following equation:
t
CSC
= (1/f
SYS
) x PCSSCK x CSSCK
The following table lists the delay scaler values.
Table 50-33. Delay Scaler Encoding
Field Value
Delay Scaler Value
0000
2
0001
4
0010
8
0011
16
0100
32
0101
64
0110
128
0111
256
1000
512
1001
1024
1010
2048
1011
4096
1100
8192
1101
16384
Table continues on the next page...
Chapter 50 SPI (DSPI)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
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