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STM32F031G4 Datasheet(PDF) 11 Page - STMicroelectronics |
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STM32F031G4 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 106 page DocID025743 Rev 4 11/106 STM32F031x4 STM32F031x6 Functional overview 22 3 Functional overview Figure 1 shows the general block diagram of the STM32F031x4/x6 devices. 3.1 ARM®-Cortex®-M0 core The ARM® Cortex®-M0 is a generation of ARM 32-bit RISC processors for embedded systems. It has been developed to provide a low-cost platform that meets the needs of MCU implementation, with a reduced pin count and low-power consumption, while delivering outstanding computational performance and an advanced system response to interrupts. The ARM® Cortex®-M0 processors feature exceptional code-efficiency, delivering the high performance expected from an ARM core, with memory sizes usually associated with 8- and 16-bit devices. The STM32F031x4/x6 devices embed ARM core and are compatible with all ARM tools and software. 3.2 Memories The device has the following features: • 4 Kbytes of embedded SRAM accessed (read/write) at CPU clock speed with 0 wait states and featuring embedded parity checking with exception generation for fail-critical applications. • The non-volatile memory is divided into two arrays: – 16 to 32 Kbytes of embedded Flash memory for programs and data – Option bytes The option bytes are used to write-protect the memory (with 4 KB granularity) and/or readout-protect the whole memory with the following options: – Level 0: no readout protection – Level 1: memory readout protection, the Flash memory cannot be read from or written to if either debug features are connected or boot in RAM is selected – Level 2: chip readout protection, debug features (Cortex®-M0 serial wire) and boot in RAM selection disabled 3.3 Boot modes At startup, the boot pin and boot selector option bit are used to select one of the three boot options: • Boot from User Flash memory • Boot from System Memory • Boot from embedded SRAM The boot loader is located in System Memory. It is used to reprogram the Flash memory by using USART on pins PA14/PA15 or PA9/PA10. |
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