Data Sheet

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Espressif Systems
ESP8266 Datasheet
3.2. Secure Digital Input/Output Interface (SDIO) 18 ...................................................
3.3. Serial Peripheral Interface (SPI/HSPI) 18 ..................................................................
3.3.1. General SPI (Master/Slave) 18 ..................................................................................
3.3.2. SDIO / SPI (Slave) 19 .................................................................................................
3.3.3. HSPI (Master/Slave) 19 ..............................................................................................
3.4. Inter-integrated Circuit Interface (I2C) 19 ...............................................................
3.5. I2S 20 ...........................................................................................................................
3.6. Universal Asynchronous Receiver Transmitter (UART) 20 .....................................
3.7. Pulse-Width Modulation (PWM) 21 ..........................................................................
3.8. IR Remote Control 22 .................................................................................................
3.9. ADC (Analog-to-digital Converter) 22 .....................................................................
3.10. LED Light and Button 24 ............................................................................................
4. Firmware & Software Development Kit 26 ...........................................................
4.1. Features 26 ..................................................................................................................
5. Power Management 27 ............................................................................................
6. Clock Management 28 .............................................................................................
6.1. High Frequency Clock 28 ..........................................................................................
6.2. External Reference Requirements 29 .......................................................................
7. Radio 29 .....................................................................................................................
7.1. Channel Frequencies 30 ............................................................................................
7.2. 2.4 GHz Receiver 30 ...................................................................................................
7.3. 2.4 GHz Transmitter 30 ..............................................................................................
Espressif Systems / August 1, 2015
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