ESP32 datasheet(36/64 Pages) ESPRESSIF

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4. Peripherals and Sensors

4.1.15 Pulse Width Modulation (PWM)

The Pulse Width Modulation (PWM) controller can be used for driving digital motors and smart lights. The controller

consists of PWM timers, the PWM operator and a dedicated capture sub-module. Each timer provides timing in

synchronous or independent form, and each PWM operator generates a waveform for one PWM channel. The

dedicated capture sub-module can accurately capture events with external timing.

4.1.16 LED PWM

The LED PWM controller can generate 16 independent channels of digital waveforms with configurable periods

and duties.

The 16 channels of digital waveforms operate with an APB clock of 80 MHz. Eight of these channels have the

option of using the 8 MHz oscillator clock. Each channel can select a 20-bit timer with configurable counting range,

while its accuracy of duty can be up to 16 bits within a 1 ms period.

The software can change the duty immediately. Moreover, each channel automatically supports step-by-step duty

increase or decrease, which is useful for the LED RGB color-gradient generator.

4.1.17 Serial Peripheral Interface (SPI)

ESP32 features three SPIs (SPI, HSPI and VSPI) in slave and master modes in 1-line full-duplex and 1/2/4-line

half-duplex communication modes. These SPIs also support the following general-purpose SPI features:

• Four modes of SPI transfer format, which depend on the polarity (CPOL) and the phase (CPHA) of the SPI

clock

• Up to 80 MHz (The actual speed it can reach depends on the selected pads, PCB tracing, peripheral char-

acteristics, etc.)

• up to 64-byte FIFO

All SPIs can also be connected to the external flash/SRAM and LCD. Each SPI can be served by DMA con-

trollers.

4.1.18 Accelerator

ESP32 is equipped with hardware accelerators of general algorithms, such as AES (FIPS PUB 197), SHA (FIPS

PUB 180-4), RSA, and ECC, which support independent arithmetic, such as Big Integer Multiplication and Big

Integer Modular Multiplication. The maximum operation length for RSA, ECC, Big Integer Multiply and Big Integer

Modular Multiplication is 4096 bits.

The hardware accelerators greatly improve operation speed and reduce software complexity. They also support

code encryption and dynamic decryption, which ensures that code in the flash will not be hacked.

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ESP32 Datasheet V3.4

ESP32 Datasheet(PDF) 36 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.