Deserial Serial Peripheral Interface (DSPI)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
23-17
Preliminary
23.3.2.4
DSPI Status Register (DSPI_SR)
The DSPI_SR contains status and flag bits. The bits reflect the status of the DSPI and indicate the
occurrence of events that can generate interrupt or DMA requests. Software can clear a flag bit in the
DSPI_SR by writing a 1 to it. Writing a 0 to a flag bit has no effect.
NOTE
This register cannot be written in MDIS Mode, owing to the use of power
saving mechanisms.
BR
Baud Rate Scaler. Selects the scaler value for the baud rate. This field is used in master mode only. The
pre-scaled system clock is divided by the baud rate scaler to generate the frequency of the SCK. The table below
lists the baud rate scaler values.
The baud rate is computed according to the following equation:
Note: See
Section 23.4.7.1, “Baud Rate Generator
,” for more details.
Table 23-4. DSPI_CTARn Field Description (continued)
Field
Description
BR
Baud Rate Scaler
Value
BR
Baud Rate Scaler
Value
0000
2
1000
256
0001
4
1001
512
0010
6
1010
1024
0011
8
1011
2048
0100
16
1100
4096
0101
32
1101
8192
0110
64
1110
16384
0111
128
1111
32768
SCK baud rate
f
SYS
PBRPrescalerValue
----------------------------------------------------------
1
DBR
+
BRScalerValue
--------------------------------------------
×
=