Espressif ESP32 Technical Reference Manual page 221

9 SD/MMC Host Controller
31
0 0 0 0 0 0 0
DEBOUNCE_COUNT Number of host clocks (clk) used by debounce filter logic. The typical de-
bounce time is 5 ~ 25 ms to prevent the card instability when the card is inserted or removed.
(R/W)
31
USRID_REG User identification register, value set by user. Default reset value can be picked by
user while configuring core before synthesis. Can also be used as a scratchpad register by user.
(R/W)
31
RST_CARD_RESET Hardware reset.1: Active mode; 0: Reset. These bits cause the cards to enter
pre-idle state, which requires them to be re-initialized. CARD_RESET[0] should be set to 1'b0 to
reset card0, CARD_RESET[1] should be set to 1'b0 to reset card1.The number of bits implemented
is restricted to NUM_CARDS. (R/W)
Espressif Systems
Register 9.24. DEBNCE_REG (0x0064)
24 23
0
Register 9.25. USRID_REG (0x0068)
0x000000000
Register 9.26. RST_N_REG (0x0078)
0
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0x0000000
221
0
Reset
0
Reset
2 1 0
0x1
Reset
ESP32 TRM (Version 5.2)