If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
请看一下手册第二页。 – Up to Three MMC, SD, SDIO Ports – 1-, 4- and 8-Bit MMC, SD, SDIO Modes – MMCSD0 has Dedicated Power Rail for 1.8‑V or 3.3-V Operation – Up to 48-MHz Data Transfer Rate – Supports Card Detect and Write Protect – Complies With MMC4.3, SD, SDIO 2.0
