ESP32-PICO datasheet(27/64 Pages) ESPRESSIF

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4 Peripherals

4.1

Peripheral Overview

ESP32-PICO integrates a rich set of peripherals including SPI, I2S, UART, I2C, pulse count controller, TWAI®,

ADC, DAC, touch sensor, etc.

To learn more about on-chip components, please refer to ESP32 Series Datasheet > Section Functional

Description.

Note:

The ESP32-PICO series of variants are similar to ESP32. The content below is sourced from ESP32 Series Datasheet

> Section Functional Description. Some information may not be applicable to ESP32-PICO as not all the IO signals are

exposed on the SiP.

To learn more about peripheral signals, please refer to ESP32 Technical Reference Manual > Section Peripheral Signal

List.

4.2

Digital Peripherals

4.2.1

General Purpose Input / Output Interface (GPIO)

ESP32 has 34 GPIO pins which can be assigned various functions by programming the appropriate registers.

There are several kinds of GPIOs: digital-only, analog-enabled, capacitive-touch-enabled, etc. Analog-enabled

GPIOs and Capacitive-touch-enabled GPIOs can be configured as digital GPIOs.

Most of the digital GPIOs can be configured as internal pull-up or pull-down, or set to high impedance. When

configured as an input, the input value can be read through the register. The input can also be set to

edge-trigger or level-trigger to generate CPU interrupts. Most of the digital IO pins are bi-directional,

non-inverting and tristate, including input and output buffers with tristate control. These pins can be

multiplexed with other functions, such as the SDIO, UART, SPI, etc. (More details can be found in

ESP32 Series Datasheet > Appendix, Table IO_MUX. ) For low-power operations, the GPIOs can be set to

hold their states.

For details, see ESP32 Series Datasheet > Section Peripheral Pin Configurations, ESP32 Series Datasheet >

Appendix A – ESP32 Pin Lists and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix.

4.2.2

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.

Features of General Purpose SPI (GP-SPI)

• Programmable data transfer length, in multiples of 1 byte

• Four-line full-duplex/half-duplex communication and three-line half-duplex communication support

• Master mode and slave mode

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ESP32-PICO Series Datasheet v1.1

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