MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
20-19
20.3.2.4
DSPI Status Register (DSPIx_SR)
The DSPI
x
_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
DSPI
x
_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
7
8
9
10
11
12
13
14
15
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
Reset
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
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
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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
----------------------------------------------------------
1
DBR
+
BRScalerValue
--------------------------------------------
=
Summary of Contents for MPC5553
Page 5: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 2 Freescale Semiconductor...
Page 21: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 xvi Freescale Semiconductor...
Page 47: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 1 26 Freescale Semiconductor...
Page 163: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 4 20 Freescale Semiconductor...
Page 179: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 5 16 Freescale Semiconductor...
Page 561: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 13 38 Freescale Semiconductor...
Page 615: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 14 54 Freescale Semiconductor...
Page 707: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 17 68 Freescale Semiconductor...
Page 755: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 18 48 Freescale Semiconductor...
Page 873: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 19 118 Freescale Semiconductor...
Page 984: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 Freescale Semiconductor 21 41...
Page 985: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 21 42 Freescale Semiconductor...
Page 1019: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 22 34 Freescale Semiconductor...
Page 1129: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 25 90 Freescale Semiconductor...