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2 / 134 page DocID024738 Rev 5 2/134 STM32F401xB STM32F401xC Contents 4 Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1 Compatibility with STM32F4 series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3 Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.1 ARM® Cortex®-M4 with FPU core with embedded Flash and SRAM . . . 15 3.2 Adaptive real-time memory accelerator (ART Accelerator™) . . . . . . . . . 15 3.3 Memory protection unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.4 Embedded Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.5 CRC (cyclic redundancy check) calculation unit . . . . . . . . . . . . . . . . . . . 16 3.6 Embedded SRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.7 Multi-AHB bus matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.8 DMA controller (DMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.9 Nested vectored interrupt controller (NVIC) . . . . . . . . . . . . . . . . . . . . . . . 17 3.10 External interrupt/event controller (EXTI) . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.11 Clocks and startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.12 Boot modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.13 Power supply schemes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.14 Power supply supervisor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.14.1 Internal reset ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.14.2 Internal reset OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.15 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.15.1 Regulator ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.15.2 Regulator OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.15.3 Regulator ON/OFF and internal power supply supervisor availability . . 24 3.16 Real-time clock (RTC) and backup registers . . . . . . . . . . . . . . . . . . . . . . 24 3.17 Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.18 VBAT operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.19 Timers and watchdogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.19.1 Advanced-control timers (TIM1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.19.2 General-purpose timers (TIMx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 |
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