STM32L432Kx Flash Size
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The STM32L432Kx is available with two different flash sizes. The STM32L432KB has got 128 kB while the STM32L432KC has got 256 kB. I recently created a USB "key" using the STM32L432. The reason for using this specific STM32 MCU was twofold:
- It is small
- It's got a built-in 48 MHz oscillator precise enough to use USB without an external crystal
Unfortunately, while I wanted the 256 kB version, only the 128 kB version was available.
The STM32 Blue Pill boards mostly use Chinese clone MCUs but there has been a lot of writing about the original ones having 128 kB of flash rather than the 64 kB specified by the datasheet. There is even a test tool available which can test for the hidden flash.
Inspired by this, I decided to test the STM32L432KB on my own board.