Hardware

Boot modes

Boot mode	GPIO0	GPIO2	GPIO15
SPI FLASH (normal run)	1	1	0
UART (programming)	0	1	0
SD card	x	x	1

Links

• ESP-12F board description
• ESP-12F datasheet local-copy
• ESP8266 datasheet from Espresiff local-copy
• NodeMCU GPIO module documentation
• Using ESP8266 GPIO0/2/15 pins

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