MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 20-19
20.3.2.4 DSPI Status Register (DSPIx_SR)
The DSPIx_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 flag bits in the
DSPIx_SR by writing a 1 to it. Writing a 0 to a flag bit has no effect.
28–31 BR
[0:3]
Baud rate scaler. Selects the scaler value for the baud rate. This field is only used in
master mode. 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 20.4.6.1, “Baud Rate Generator,” for more details.
0 1 2 3 4 5 6 78 9 101112131415
R TCF TXRXS 0 EOQF TFUF 0 TFFF 0 0 0 0 0 RFOF 0 RFDF 0
W w1c w1c w1c w1c w1c w1c w1c
Reset0000001000000000
Reg Addr Base + 0x002C
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R TXCTR TXNXTPTR RXCTR POPNXTPTR
W
Reset0000000000000000
Reg Addr Base + 0x002C
Figure 20-6. DSPI Status Register (DSPIx_SR)
Table 20-5. DSPIx_CTARn Field Description (Continued)
Bits Name 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
----------------------------------------------------------
1DBR+
BRScalerValue
--------------------------------------------
=
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