Migration guide from STM32F7 Series and STM32H743/753 line to STM32H7A3/7B3 line devices
■Designers of STM32 microcontroller applications must be able to easily replace one microcontroller type with another one from the same product family or from a different family. The reasons for migrating an application to a different microcontroller can be for example:
◆ To fulfill extended product requirements, extra demands on memory size, or an increased number of I/Os
◆ To meet cost reduction constraints that require a switch to smaller components and a shrunk PCB area
■This application note analyzes the steps required to migrate from an existing STM32F7 Series or STM32H743/753 line designto a design based on an STM32H7A3/7B3 line device.This application note provides a guideline on both hardware and peripheral migration. To better understand the information inside this application note, the user should be familiar with the STM32 microcontroller family.
●devices overview
■The STM32H7A3/7B3 maximum theoretical performance of the Cortex® -M7 core is 1240 CoreMark / 535 DMIPS at 250 MHz fCPU. STM32H7A3/7B3 devices deliver this maximum theoretical performance by taking advantage of an L1-cache regardless if the code is executed from the embedded Flash or external memory.
■Both STM32H743/753 and STM32H7A3/7B3 devices offer extra performance versus the STM32F7 Series without additional complexity.
■STM32H743/753 and STM32H7A3/7B3, as Cortex® -M7 variants, are compatible with the STM32F7 Series devices (for the common packages). This compatibility allows customers to easily migrate from STM32F7 Series towards STM32H7A3/7B3 and to benefit from their significantly higher performance and their advanced peripherals.
■STM32H7A3/7B3 devices are also the entry point of the wider STM32H7 Series, which can be seen as an easy stepladder to benefit from the high performance, the rich connectivity and the enhanced features of this advanced platform.
■STM32H7A3/7B3 devices include a larger set of peripherals with advanced features and optimized power consumption compared to STM32F7 Series such as:
◆ Low-power universal asynchronous receiver transmitter (LPUART)
◆ Single wire protocol master interface (SWPMI)
◆ FD controller area network (FDCAN)
◆ Operational amplifiers (OPAMP)
◆ Comparator (COMP)
◆ Voltage reference buffer (VREFBUF)
◆ Switch mode power supply step down converter (SMPS)
■When compared to STM32H743/753 line devices, STM32H7A/H7B microcontrollers offer the following additional features:
◆ Further optimized power consumption, significant in the low-power modes
◆ Simplification of the power domains
◆ Increased internal RAM size, very useful for graphics applications
◆ DFSDM increased to nine filters with dedicated DMA
◆ Two OCTOSPI interface, instead of a single QUADSPI
◆ Possibility to store encrypted code or data on external Octo-SPI memories (for STM32H7B3 devices)
◆ Graphical oriented memory management unit (GFXXMMU)
◆ New tampers and active tamper which increases the security level
■This migration guide covers the migration from STM32F7 Series and STM32H743/753 line microcontrollers towards STM32H7A3/7B3 line devices.
■The new features present on STM32H7A3/7B3 but not already present on STM32F7 Series or STM32H743/753devices are not covered in this document. Refer to the STM32H7A3/7B3 reference manual and datasheets for more details).
■The migration from STM32F7 Series to STM32H743/753 devices is covered in detail in the application note Migration of microcontroller applications from STM32F7 Series to STM32H7x3 line microcontrollers (AN4936).
■This document applies to Arm®-based devices.
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STM32F7 Series 、 STM32F7 、 STM32H743 、 STM32H753 、 STM32H7A3 、 STM32H7B3 、 STM32 、 STM32F75xxx 、 STM32F74xxx 、 STM32F76xxx 、 STM32F77xxx |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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31-Jan-2020 |
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Rev 3 |
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AN5293 |
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552 KB |
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