STMicro Using OctaBus Flash Memory from Macronix

By Perry Cohen

Associate Editor

Embedded Computing Design

April 15, 2021


STMicro Using OctaBus Flash Memory from Macronix

Macronix announced that STMicroelectronics is using its OctaBus flash memory for a wide range of STM32 microcontroller (MCU) platforms.

This includes the STM32H72x/73x, STM32L5, and the STM32U5. The MX25 OctaBus family further provides high-performance memory on select STM32 Discovery Kits and Eval Boards.

The STM32 devices are able to embed up to two Octal SPI ports, which support the OctaBus interface. This interface is made of Macronix’s octaflash 8 I/O NOR and OctaRAM memories.

OctaBus memory devices sport an operational frequency of 250MHz with 500MB/s read throughput.

According to a company press release, the MX25LW/UW OctaBus memory family has exceptional features for efficient management of over-the-air (OTA) software updates and data logging. Those features of the MX25LW/UW family are also a natural extension as execute-in-place (XIP) memory for STM32 MCUs. OctaBus memory offered in densities up to 2Gb can support the most advanced graphical user interfaces.

STMicroelectronics’ STM32 family, which implies the devices host a 32-bit MCU, is based on the Arm Cortex-M processor and is designed to provide freedom to MCU users.

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Perry Cohen, associate editor for Embedded Computing Design, is responsible for web content editing and creation, podcast production, and social media efforts. Perry has been published on both local and national news platforms including (Phoenix), (Phoenix),, Cronkite News, and MLB/MiLB among others. Perry received a BA in Journalism from the Walter Cronkite School of Journalism and Mass Communications at Arizona State university.

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