Espressif ESP32 Technical Reference Manual page 220

9 SD/MMC Host Controller
31
CARD_DETECT_N Value on card_detect_n input ports (1 bit per card), read-only bits.0 represents
presence of card. Only NUM_CARDS number of bits are implemented. (RO)
31
WRITE_PROTECT Value on card_write_prt input ports (1 bit per card).1 represents write protection.
Only NUM_CARDS number of bits are implemented. (RO)
31
TCBCNT_REG Number of bytes transferred by CIU unit to card. (RO)
31
TBBCNT_REG Number of bytes transferred between Host/DMA memory and BIU FIFO. (RO)
Espressif Systems
Register 9.20. CDETECT_REG (0x0050)
0x0
Register 9.21. WRTPRT_REG (0x0054)
0x0
Register 9.22. TCBCNT_REG (0x005C)
0x000000000
Register 9.23. TBBCNT_REG (0x0060)
0x000000000
220
Submit Documentation Feedback
2 1 0
0x0
Reset
2 1 0
0x0
Reset
0
Reset
0
Reset
ESP32 TRM (Version 5.2)