ESP32C3 datasheet(21/44 Pages) ESPRESSIF

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Functional Description

– In slave mode, the clock frequency is 60 MHz at most, and the four modes of SPI transfer format are

also supported.

The mapping between SPI bus signals and GPIO pins is shown in Table 8:

Table 8: Mapping of SPI Signals and Chip Pads

FullDuplex

HalfDuplex

Chip Pin Signal

SPI Signal

Pin Function

FSPI Signals

MOSI

FSPID

MISO

(MISO)

FSPIQ

FSPICS0

~ 5

CLK

FSPICLK

—

FSPIWP

—

FSPIHD

In most cases, the data port connection between ESP32-C3 and external flash is as follows:

Table 9: Connection Between ESP32C3 and External Flash

External Flash Data Port

Chip Pin

SPI SingleLine Mode

SPI TwoLine Mode

SPI FourLine Mode

SPID (SPID)

IO0

SPIQ (SPIQ)

IO1

SPIWP (SPIWP)

WP#

—

IO2

SPIHD (SPIHD)

HOLD#

—

IO3

3.4.3 Universal Asynchronous Receiver Transmitter (UART)

ESP32-C3 has two UART interfaces, i.e. UART0 and UART1, which support IrDA and asynchronous

communication (RS232 and RS485) at a speed of up to 5 Mbps. The UART controller provides hardware flow

control (CTS and RTS signals) and software flow control (XON and XOFF). Both UART interfaces connect to

GDMA via UHCI0, and can be accessed by the GDMA controller or directly by the CPU.

3.4.4 I2C Interface

ESP32-C3 has an I2C bus interface which is used for I2C master mode or slave mode, depending on your

configuration. The I2C interface supports:

• standard mode (100 Kbit/s)

• fast mode (400 Kbit/s)

• up to 800 Kbit/s (constrained by SCL and SDA pull-up strength)

• 7-bit and 10-bit addressing mode

• double addressing mode

• 7-bit broadcast address

You can configure instruction registers to control the I2C interface for more flexibility.

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ESP32-C3 Series Datasheet v1.1

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