User's Manual

2.
Pin Definitions
Note:
FE: falling-edge, RE: rising-edge.
Firmware can configure register bits to change the settings of ”Voltage of Internal LDO (VDD_SDIO)” and ”Timing
of SDIO Slave”, after booting.
The operating voltage of ESP32-PICO-V3-ZERO’s integrated external SPI flash is 3.3 V. Therefore, the strapping
pin MTDI should hold bit ”0” during the module power-on reset.
Espressif Systems