STMicroelectronics has extended its STM32 microcontroller family with extra features and up to 1 MByte of on-chip Flash. The additional Flash at least doubles the memory available to STM32 developers.
Additional new features of the STM32 XL-density devices include extra high-speed volatile memory (RAM), up to 96 KB, which can simplify software design and speed up execution. Six more timers are also included, increasing flexibility for applications such as motor control, factory automation or power distribution. Furthermore, a memory protection unit has been added, which is transparent to existing software but allows new applications to protect specific code or data during execution. This feature permits efficient use of existing certified software modules in projects such as medical or metering equipment.
The 1 MB Flash memory is organised in two banks of 512 KB. This dual-bank architecture enables safe upgrading of applications in the field by uploading new software into the second memory bank. The update can then be copied across safely into the main bank, and the process managed to protect against hazards such as power loss while the upgrade is being applied.
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