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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
20-67
20.5.4
MPC5xx QSPI Compatibility with the DSPI
shows the translation of commands written to the TX FIFO command halfword with
commands written to the command RAM of the MPC5xx family QSPI. The table illustrates how to
configure the DSPI
x
_CTARs to match the default cases for the possible combinations of the MPC5xx
family control bits in its command RAM. The defaults for the MPC5xx family are based on a system clock
of 40MHz. All delay variables below will generate the same delay, or as close as possible, from the DSPI
100MHz system clock that an MPC5xx family part would generate from its 40MHz system clock. For
other system clock frequencies, the customer can recompute the values using the information presented in
Section 20.5.3, “Delay Settings
For BITSE = 0 --> 8 bits per transfer
For DT = 0 --> 0.425
s delay: For this value, the closest value in the DSPI is 0.480
s
For DSCK = 0 --> 1/2 SCK period: For this value, the value for the DSPI is 20ns
Table 20-32. Delay Values
Delay Prescaler Values
(DSPI_CTAR[PBR])
1
3
5
7
De
la
y Sc
aler
V
a
lues
(DSPI_CT
A
R[DT])
2
20.0 ns
60.0 ns
100.0 ns
140.0 ns
4
40.0 ns
120.0 ns
200.0 ns
280.0 ns
8
80.0 ns
240.0 ns
400.0 ns
560.0 ns
16
160.0 ns
480.0 ns
800.0 ns
1.1
s
32
320.0 ns
960.0 ns
1.6
s
2.2
s
64
640.0 ns
1.9
s
3.2
s
4.5
s
128
1.3
s
3.8
s
6.4
s
9.0
s
256
2.6
s
7.7
s
12.8
s
17.9
s
512
5.1
s
15.4
s
25.6
s
35.8
s
1024
10.2
s
30.7
s
51.2
s
71.7
s
2048
20.5
s
61.4
s
102.4
s
143.4
s
4096
41.0
s
122.9
s
204.8
s
286.7
s
8192
81.9
s
245.8
s
409.6
s
573.4
s
16384
163.8
s
491.5
s
819.2
s
1.1 ms
32768
327.7
s
983.0
s
1.6 ms
2.3 ms
65536
655.4
s
2.0 ms
3.3 ms
4.6 ms
Содержание MPC5553
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