STM32WB50CG datasheet(14/119 Pages) STMICROELECTRONICS

14 / 119 page

Functional overview

STM32WB50CG STM32WB30CE

14/119

DS13047 Rev 5

Functional overview

3.1

Architecture

The STM32WB50CG and STM32WB30CE multiprotocol wireless device embeds a BLE or

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 or 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 or 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, 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 STM32WB50CG and STM32WB30CE are compatible

with all Arm® tools and software.

Figure 1 and Figure 2 show the general block diagram of, respectively, the STM32WB50CG

and STM32WB30CE devices.

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