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Deserial Serial Peripheral Interface (DSPI)
MPC5566 Microcontroller Reference Manual, Rev. 2
20-14
Freescale Semiconductor
The following table describes the fields in the DSPI clock and transfer attributes register:
Table 20-5. 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. See the BR field and
Section 20.4.6.1, “Baud Rate Generator
” for details on how to compute the baud
rate. If the overall baud rate is divided by two or three system clocks, do not enable continuous SCK or the modified
timing format.
0 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 MPC5566
Page 81: ...Introduction MPC5566 Microcontroller Reference Manual Rev 2 1 24 Freescale Semiconductor...
Page 135: ...Signal Description MPC5566 Microcontroller Reference Manual Rev 2 2 54 Freescale Semiconductor...
Page 189: ...Reset MPC5566 Microcontroller Reference Manual Rev 2 4 20 Freescale Semiconductor...
Page 603: ...Flash Memory MPC5566 Microcontroller Reference Manual Rev 2 13 38 Freescale Semiconductor...
Page 609: ...SRAM MPC5566 Microcontroller Reference Manual Rev 2 14 6 Freescale Semiconductor...
Page 1073: ...MPC5566 Microcontroller Reference Manual Rev 2 22 36 Freescale Semiconductor...
Page 1185: ...Nexus MPC5566 Microcontroller Reference Manual Rev 2 25 92 Freescale Semiconductor...