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STM32F103x8, STM32F103x - Medium-density performance line Arm®-based 32-bit MCU:

Datasheet - Rev. 20 (2025-07)
Errata - ES096 - STM32F101x8/B, STM32F102x8/B and STM32F103x8/B medium-density device errata - Rev. 15 (2022-03)

Old datasheet:

Datasheet - Rev. 12 (2010-06)