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RM0319 Datasheet(PDF) 183 Page - STMicroelectronics

Part # RM0319
Description  SPEAr320S architecture and functionality
PDF  368 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RM0319 Datasheet(HTML) 183 Page - STMicroelectronics

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RM0319
MMC-SD card/SDIO controller
Doc ID 022640 Rev 3
183/368
14.5.2
Supplying the SD clock
Figure 59.
SD clock supply sequence
1.
Calculate a divisor to determine the frequency of the SD clock.
2.
Set Internal Clock Enable and SDCLK Frequency Select in the Clock Control register.
3.
Check Internal Clock Stable in the Clock Control register. Repeat this step until Clock
Stable is logic ‘1’.
4.
Set SD Clock Enable in the Clock Control register to logic ‘1’.
The Host Controller starts to supply the SD Clock.
Calculate a divisor for SD
clock frequency
Start
Set SDCLK Frequency Select
and Internal Clock Enable
Check
Internal Clock Stable
End
(1)
(2)
(3)
(4)
Set SD Clock On
Supply SD Clock
Internal Clock Stable = 1b
Internal Clock Stable = 0b



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