Deserial Serial Peripheral Interface (DSPI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
19-14
Freescale Semiconductor
The following table describes the fields in the DSPI clock and transfer attributes register:
Table 19-5. DSPI
x
_CTAR
n
Field Description
Field
Description
0
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 the
following table. Refer to the BR field below and
Section 19.4.6.1, “Baud Rate Generator
” for details on how to
compute the baud rate. If the overall baud rate is divided by two or divided by three of the system clock, do not enable
continuous SCK or the modified timing format.
0 The baud rate is computed normally with a 50/50 duty cycle
1 Baud rate is doubled with the duty cycle depending on the baud rate prescaler
1–4
FMSZ
[0:3]
FMSZ. Selects the number of bits transferred per frame. The FMSZ field is used in master mode and slave mode.
The following table lists the frame sizes.
DBR
CPHA
PBR
SCK Duty Cycle
0
any
any
50/50
1
0
00
50/50
1
0
01
33/66
1
0
10
40/60
1
0
11
43/57
1
1
00
50/50
1
1
01
66/33
1
1
10
60/40
1
1
11
57/43
FMSZ
Frame Size
FMSZ
Frame Size
0000
Invalid value
1000
9
0001
Invalid value
1001
10
0010
Invalid value
1010
11
0011
4
1011
12
0100
5
1100
13
0101
6
1101
14
0110
7
1110
15
0111
8
1111
16
Summary of Contents for MPC5565
Page 18: ...MPC5565 Microcontroller Reference Manual Devices Supported MPC5565 MPC5565 RM Rev 1 0 09 2007...
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Page 973: ...Preface MPC5565 Microcontroller Reference Manual Rev 1 0 21 36 Freescale Semiconductor...
Page 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...