STM32WB09XE datasheet(23/73 Pages) STMICROELECTRONICS

23 / 73 page

3.23

Inter-IC sound (I2S)

The STM3WB09xE SPI interface: SPI3 supports the I2S protocol. The I2S interface can operate in slave or

master mode with half-duplex communication. It can address four different audio standards:

•

Philips I2S standard

•

MSB-justified standards (left-justified)

•

LSB-justified standards (right-justified)

•

PCM standard.

The I2S interfaces DMA capability for transmission and reception.

3.24

Serial peripheral interface (SPI)

The STM3WB09xE has one SPI interface (SPI3) allowing communication up to 32 Mbit/s in both master and

slave modes. The SPI peripheral supports:

•

Master or slave operation

•

Multimaster support

•

Full-duplex synchronous transfers on three lines

•

Half-duplex synchronous transfer on two lines (with bidirectional data line)

•

Simplex synchronous transfers on two lines (with unidirectional data line)

•

Serial communication with external devices

•

NSS management by hardware or software for both master and slave: dynamic change of master/slave

operations

•

SPI Motorola support

•

SPI TI mode support

•

Hardware CRC feature for reliable communication

All SPI interfaces can be served by the DMA controller.

3.25

Serial wire debug port

The embeds an Arm SWD interface that allows interactive debugging and programming of the device. The

interface is composed of only two pins: DEBUG_SWDIO and DEBUG_SWCLK. The enhanced debugging

features for developers allow up to four breakpoints and up to two watchpoints.

3.26

TX and RX event alert

The STM3WB09xE is provided with the RADIO_TX_SEQUENCE and RADIO_RX_SEQUENCE signals which

alert, respectively, transmission and reception activities.

A signal can be enabled for TX and RX on two pins, through alternate functions:

•

RADIO_TX_SEQUENCE is available on PA10 (AF2) or PB14 (AF1).

•

RADIO_RX_SEQUENCE is available on PA8 (AF2) or PA11 (AF2).

The signal is high when radio is in TX (or RX), low otherwise.

The signals can be used to control external antenna switching and support coexistence with other wireless

technologies.

Note:

The RADIO_RF_ACTIVITY signal is used to notify if there is an ongoing RF operation ( either TX or RX). It is a

logical OR between the RADIO_RX_SEQUENCE and RADIO_TX_SEQUENCE. This signal can be used to

enable an antenna switch component when achieving antenna switching during AoA or AoD operation.

STM32WB09xE

Functional overview

DS14210 - Rev 6

page 23/73

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