CXD5602 User Manual
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Clock Frequency Division for SPI Flash Controller
The frequency of the clock for the SPI Flash Controller is determined by the ck_cpu_bus frequency and the
register setting value. The following equations show the frequency division of the clock for the SPI Flash
Controller.
Frequency division of the clock for the SPI Flash Controller based on the ck_cpu_bus
ck_sfc_sfclk_gear
= frequency division(D)
ck_sfc_hclk_low_gear
= frequency division(D) x 2
Note:
Refer to Table SYSIOP Clock and Reset Control-806 for the frequency division(D).
Table SYSIOP Clock and Reset Control-766 Frequency Division Setting of Clock for the SPI Flash Controller
CKDIV_CPU_DSP_BUS.SFC_HCLK_LOW
Frequency
Division(D)
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
16
11
32
12
64
13
128
14
256
15
512
Caution upon Setting the Frequency Division
When the SPI Flash Controller is not used, set CKDIV_CPU_DSP_BUS.SFC_HCLK_LOW to “0”.
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