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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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RM0319 데이터시트(PDF) 183 Page - STMicroelectronics |
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RM0319 데이터시트(HTML) 183 Page - STMicroelectronics |
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183 / 368 page  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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