Espressif ESP32 Technical Reference Manual page 518

18 Timer Group (TIMG)
31
TIMGn_WDTFEED_REG Write any value to feed the MWDT. (WO)
31
TIMGn_WDTWPROTECT_REG If the register contains a different value than its reset value, write pro-
tection is enabled. (R/W)
31 30
0
TIMGn_RTC_CALI_START_CYCLING Reserved. (R/W)
TIMGn_RTC_CALI_CLK_SEL Used to select the clock to be calibrated. 0: RC_SLOW_CLK. 1:
RC_FAST_DIV_CLK. 2: XTAL32K_CLK. (R/W)
TIMGn_RTC_CALI_RDY Set this bit to mark the completion of calibration. (RO)
TIMGn_RTC_CALI_MAX Calibration time, in cycles of the clock to be calibrated. (R/W)
TIMGn_RTC_CALI_START Set this bit to starts calibration. (R/W)
Espressif Systems
Register 18.16. TIMGn_WDTFEED_REG (0x0060)
0x000000000
Register 18.17. TIMGn_WDTWPROTECT_REG (0x0064)
0x050D83AA1
Register 18.18. TIMGn_RTCCALICFG_REG (0x0068)
16
0x01
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15 14 13 12 11
0 0x1 1 0 0 0 0
518
0
0
0
0 0 0 0 0 0 0 0
ESP32 TRM (Version 5.2)
Reset
Reset
Reset