Espressif ESP8266 Technical Reference page 8

10.3. API Function Description
10.3.1. Void Function
10.3.2. CONF Function
10.3.3. START Function
11. UART Introduction
11.1. Functional Overview
11.2. Hardware Resources
11.3. Parameter Configuration
11.3.1. The Baud Rate
11.3.2. Parity Bit
11.3.3. Data Bit
11.3.4. Stop Bit
11.3.5. Inverting
11.3.6. Switch Output Port of Print Function
11.3.7. Read The Remaining Number of Bytes in tx / rx Queue
11.3.8. Loopback Operation (loop-back)
11.3.9. Line Stop Signal
11.3.10. Flow Control
11.3.11.Other Interfaces
11.4. Configure Interrupt
11.4.1. Interrupt register
11.4.2. Interface
11.4.3. Interrupt Type
11.5. Example of Interrupt Handler Process
11.6. Abandon Serial Output During Booting
12.PWM Interface ......................................................................................................................
12.1. Functional Overview
12.1.1. Features
12.1.2. Implementation
12.1.3. Configuration
12.1.4. Parameter Specification
12.2. Details on pwm.h
12.2.1. Sample Codes
12.2.2. Interface Specifications
12.3. Custom Channels
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