STM32WB55CC datasheet(18/193 Pages) STMICROELECTRONICS

18 / 193 page

Functional overview

STM32WB55xx STM32WB35xx

18/193

DS11929 Rev 11

Functional overview

3.1

Architecture

The STM32WB55xx and STM32WB35xx multiprotocol wireless devices embed a BLE and

an 802.15.4 RF subsystem that interfaces with a generic microcontroller subsystem using

an Arm® Cortex®-M4 CPU (called CPU1) on which the host application resides.

The RF subsystem is composed of an RF analog front end, BLE and 802.15.4 digital MAC

blocks as well as of a dedicated Arm® Cortex®-M0+ microcontroller (called CPU2), plus

proprietary peripherals. The RF subsystem performs all of the BLE and 802.15.4 low layer

stack, reducing the interaction with the CPU1 to high level exchanges.

Some functions are shared between the RF subsystem CPU (CPU2) and the Host CPU

(CPU1):



Flash memories



SRAM1, SRAM2a and SRAM2b (SRAM2a can be retained in Standby mode)



Security peripherals (RNG, AES1, PKA)



Clock RCC



Power control (PWR)

The communication and the sharing of peripherals between the RF subsystem and the

Cortex®-M4 CPU is performed through a dedicated inter processor communication

controller (IPCC) and semaphore mechanism (HSEM).

3.2

Arm® Cortex®-M4 core with FPU

The Arm® Cortex®-M4 with FPU is a processor for embedded systems. It has been

developed to provide a low-cost platform that meets the needs of MCU implementation, with

a reduced pin count and low-power consumption, while delivering outstanding

computational performance and an advanced response to interrupts.

The Arm® Cortex®-M4 with FPU 32-bit RISC processor features exceptional



code-efficiency, delivering the high-performance expected from an Arm® core in the

memory size usually associated with 8- and 16-bit devices.

The processor supports a set of DSP instructions enabling efficient signal processing and

complex algorithm execution.

Its single precision FPU speeds up software development by using metalanguage

development tools, while avoiding saturation.

With its embedded Arm® core, the STM32WB55xx and STM32WB35xx are compatible with

all Arm® tools and software.

Figure 1 and Figure 2 show the general block diagram of, respectively, the STM32WB55xx

and STM32WB35xx devices.

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