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Jul 30, 2015
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Update reference.md #633

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2 changes: 1 addition & 1 deletion hardware/esp8266com/esp8266/doc/reference.md
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Expand Up @@ -7,7 +7,7 @@ title: Reference
Pin numbers in Arduino correspond directly to the ESP8266 GPIO pin numbers. `pinMode`, `digitalRead`, and `digitalWrite` functions work as usual, so to read GPIO2, call `digitalRead(2)`.

Digital pins 0—15 can be `INPUT`, `OUTPUT`, or `INPUT_PULLUP`.
Pin 16 can be `INPUT`, `OUTPUT` or `INPUT_PULLDOWN`. At startup, pins are configured as `INPUT`.
Pin 16 can be `INPUT`, `OUTPUT` or `INPUT_PULLDOWN_16`. At startup, pins are configured as `INPUT`.

Pins may also serve other functions, like Serial, I2C, SPI. These functions are normally activated by the corresponding library. The diagram below shows pin mapping for the popular ESP-12 module.

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