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Specialized Functions of Some Pins:
PINS
EXPLANATIONS
IO23
VSPI MOSI/SPI MOSI
IO22
Wire SCL
TXD0
IO1/Serial TX
RXD0
IO3/Serial RX
IO21
Wire SDA
IO19
VSPI MISO/SPI MISO
IO18
VSPI SCK/SPI SCK
IO5
VSPI SS/SPI SS
IO4
ADC10/TOUCH0
IO0
ADC11/TOUCH1
IO2
ADC12/TOUCH2
IO15
HSPI SS/ADC13/TOUCH3/TDO
SD1
IO8/FLASH D1
SD0
IO7/FLASH D0
CLK
IO6/FLASH SCK
CMD
IO11/FLASH CMD
SD3
IO10/FLASH D3
SD2
IO9/FLASH D2
IO13
HSPI MOSI/ADC14/TOUCH4/TCK
6
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