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数据搜索系统，热门电子元器件搜索 |
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USB82642 数据表(PDF) 38 Page - Microchip Technology |
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USB82642 数据表(HTML) 38 Page - Microchip Technology |
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38 / 64 page  USB82642 DS60001253F-page 38 2012-2021 Microchip Technology Inc. 7.5.3.30 F4h: SD Clock Limit for the Flash Media Controller 7.5.3.31 F5h: Reserved 7.5.3.32 F6h: SD1 Timeout Options 7.5.3.33 F7h-FBh: Reserved 7.5.3.34 FCh-FFh: Non-Volatile Storage Signature Byte Name Type Bits Description SD_CLK_LIM Upper Nibble Bits 7:4 0 : SD/MMC - 48 MHz 1 : SD/MMC - 24 MHz 2 : SD/MMC - 20 MHz 3 : SD/MMC - 15 MHz Lower Nibble Bits 3:0 rsvd Bit Name Description 7:0 rsvd Bit Name Description 7:0 MEDIA_SETTINGS The SD1 and SD2 Timeout Options: Bit 0 : rsvd Bit 1 : rsvd Bits 2-4 : SD1 timeout Bits 5-7 : rsvd A value of 001b equates to a timeout of 0.81 seconds, where 010b indicates an additional 0.81 seconds for a total of 1.62, and so on. The maximum value is 000b (default), which indicates a total timeout of 6.5 seconds. Byte Name Description 5:0 rsvd Byte Name Description 4:0 NVSTORE_SIG This signature is used to verify the validity of the data in the first 256 bytes of the configuration area. The signature must be set to ATA2. |
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