Espressif ESP32 Technical Reference Manual page 15

Contents
30.4.13 REG_RD – Read from Peripheral Register
30.4.14 REG_WR – Write to Peripheral Register
30.5 ULP Program Execution
30.6 RTC_I2C Controller
30.6.1 Configuring RTC_I2C
30.6.2 Using RTC_I2C
30.6.2.1
30.6.2.2 I2C_WR - Write a Single Byte
30.6.2.3 Detecting Error Conditions
30.6.2.4 Connecting I²C Signals
30.7 Register Summary
30.7.1 SENS_ULP Address Space
30.7.2 RTC_I2C Address Space
30.8 Registers
30.8.1 SENS_ULP Address Space
30.8.2 RTC_I2C Address Space
31 Low-Power Management (RTC_CNTL)
31.1 Introduction
31.2 Features
31.3 Functional Description
31.3.1 Overview
31.3.2 Digital Core Voltage Regulator
31.3.3 Low-Power Voltage Regulator
31.3.4 Flash Voltage Regulator
31.3.5 Brownout Detector
31.3.6 RTC Module
31.3.7 Low-Power Clocks
31.3.8 Power-Gating Implementation
31.3.9 Predefined Power Modes
31.3.10 Wakeup Source
31.3.11 Reject Sleep
31.3.12 RTC Timer
31.3.13 RTC Boot
31.4 Register Summary
31.5 Registers
Glossary
Abbreviations for Peripherals
Abbreviations for Registers
Revision History
Espressif Systems
I2C_RD - Read a Single Byte
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ESP32 TRM (Version 5.2)