ESP8266 Technical Reference
●Overview:
■General Purpose Input/Output Interface (GPIO)
▲ESP8266EX has 17 GPIO pins which can be assigned to various functions by programming the appropriate registers.
▲Each GPIO can be configured with internal pull-up or pull-down, or set to high impedance, and when configured as an input, the data are stored in software registers; the input can also be set to edge-trigger or level trigger CPU interrupts. In short, the IO pads are bi-directional, non-inverting and tristate, which includes input and output buffer with tristate control inputs.
▲These pins can be multiplexed with other functions such as I2C, I2S, UART, PWM, IR Remote Control, etc.
▲For low power operations, the GPIOs can also be set to hold their state. For instance, when the chip is powered down, all output enable signals can be set to hold low.
▲Optional hold functionality can be built into the IO if requested. When the IO is not driven by the internal or external circuitry, the hold functionality can be used to hold the state to the last used state. The hold functionality introduces some positive feedback into the pad. Hence, the external driver that drives the pad must be stronger than the positive feedback. The required drive strength is small — in the range of 5μA to pull apart the latch.
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2016.05 |
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Version 1.0 |
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3.3 MB |
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