STM32F398VE datasheet(13/151 Pages) STMICROELECTRONICS

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STM32F398VE

Functional overview

3.1

ARM® Cortex®-M4 core with FPU with embedded Flash and

SRAM

The ARM® Cortex®-M4 processor with FPU is the latest generation of ARM processors for

embedded systems. It was 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 32-bit RISC processor with FPU 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 which allow 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 STM32F398VE is compatible with all ARM tools and

software.

Figure 1

shows the general block diagram of the STM32F398VE.

3.2

Memory protection unit (MPU)

The memory protection unit (MPU) is used to separate the processing of tasks from the data

protection. The MPU can manage up to 8 protection areas that can all be further divided up

into 8 subareas. The protection area sizes are between 32 bytes and the whole 4 gigabytes

of addressable memory.

The memory protection unit is especially helpful for applications where some critical or

certified code has to be protected against the misbehavior of other tasks. It is usually

managed by an RTOS (real-time operating system). If a program accesses a memory

location that is prohibited by the MPU, the RTOS can detect it and take action. In an RTOS

environment, the kernel can dynamically update the MPU area setting, based on the

process to be executed.

The MPU is optional and can be bypassed for applications that do not need it.

3.3

Embedded Flash memory

All STM32F398VE features 384/512 Kbyte of embedded Flash memory available for storing

programs and data. The Flash memory access time is adjusted to the CPU clock frequency

(0 wait state from 0 to 24 MHz, 1 wait state from 24 to 48 MHz and 2 wait states above).

3.4

Embedded SRAM

STM32F398VE features 80 Kbytes of embedded SRAM with hardware parity check. The

memory can be accessed in read/write at CPU clock speed with 0 wait states, allowing the

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