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STM32L476RC 数据表(PDF) 19 Page - STMicroelectronics |
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STM32L476RC 数据表(HTML) 19 Page - STMicroelectronics |
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19 / 232 page  DocID025976 Rev 4 19/232 STM32L476xx Functional overview 55 3.7 Boot modes At startup, BOOT0 pin and BOOT1 option bit are used to select one of three boot options: • Boot from user Flash • 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, I2C, SPI, CAN and USB OTG FS in Device mode through DFU (device firmware upgrade). 3.8 Cyclic redundancy check calculation unit (CRC) The CRC (cyclic redundancy check) calculation unit is used to get a CRC code using a configurable generator polynomial value and size. Among other applications, CRC-based techniques are used to verify data transmission or storage integrity. In the scope of the EN/IEC 60335-1 standard, they offer a means of verifying the Flash memory integrity. The CRC calculation unit helps compute a signature of the software during runtime, to be compared with a reference signature generated at link- time and stored at a given memory location. 3.9 Power supply management 3.9.1 Power supply schemes • VDD = 1.71 to 3.6 V: external power supply for I/Os (VDDIO1), the internal regulator and the system analog such as reset, power management and internal clocks. It is provided externally through VDD pins. • VDDA = 1.62 V (ADCs/COMPs) / 1.8 (DACs/OPAMPs) to 3.6 V: external analog power supply for ADCs, DACs, OPAMPs, Comparators and Voltage reference buffer. The VDDA voltage level is independent from the VDD voltage. • VDDUSB = 3.0 to 3.6 V: external independent power supply for USB transceivers. The VDDUSB voltage level is independent from the VDD voltage. • VDDIO2 = 1.08 to 3.6 V: external power supply for 14 I/Os (PG[15:2]). The VDDIO2 voltage level is independent from the VDD voltage. • VLCD = 2.5 to 3.6 V: the LCD controller can be powered either externally through VLCD pin, or internally from an internal voltage generated by the embedded step-up converter. • VBAT = 1.55 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and backup registers (through power switch) when VDD is not present. Note: When the functions supplied by VDDA, VDDUSB or VDDIO2 are not used, these supplies should preferably be shorted to VDD. Note: If these supplies are tied to ground, the I/Os supplied by these power supplies are not 5 V tolerant (refer to Table 19: Voltage characteristics). Note: VDDIOx is the I/Os general purpose digital functions supply. VDDIOx represents VDDIO1 or VDDIO2, with VDDIO1 = VDD. VDDIO2 supply voltage level is independent from VDDIO1. |
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