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STM32L552CC Datasheet(PDF) 48 Page - STMicroelectronics |
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STM32L552CC Datasheet(HTML) 48 Page - STMicroelectronics |
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48 / 340 page  Functional overview STM32L552xx 48/340 DS12737 Rev 6 supercapacitor is present. The VBAT pin supplies the RTC with LSE and the backup registers. Three anti-tamper detection pins are available in VBAT mode. The VBAT operation is automatically activated when VDD is not present. An internal VBAT battery charging circuit is embedded and can be activated when VDD is present. Note: When the microcontroller is supplied from VBAT, neither external interrupts nor RTC alarm/events exit the microcontroller from the VBAT operation. 3.9.8 PWR TrustZone security When the TrustZone security is activated by the TZEN option bit, the PWR is switched in TrustZone security mode. The PWR TrustZone security allows to secure the following configuration: • Low-power mode • Wake-up (WKUP) pins • Voltage detection and monitoring • VBAT mode Other PWR configuration bits are secure when: • The system clock selection is secure in RCC, the voltage scaling (VOS) configuration is secure • A GPIO is configured as secure, it's corresponding bit for Pull-up/Pull-down in standby mode is secure • The RTC is secure, the backup domain write protection bit in PWR is secure. 3.10 Peripheral interconnect matrix Several peripherals have direct connections between them, which allow autonomous communication between them and support the saving of CPU resources (thus power supply consumption). In addition, these hardware connections allow fast and predictable latency. Depending on the peripherals, these interconnections can operate in Run, Sleep, Low- power run and Sleep, Stop 0, Stop 1 and Stop 2 modes. See Table 12 for more details. Table 12. STM32L552xx peripherals interconnect matrix Interconnect source Interconnect destination Interconnect action TIMx TIMx Timers synchronization or chaining Y Y Y Y - - ADC DAC1 DFSDM1 Conversion triggers Y Y Y Y - - DMA Memory to memory transfer trigger Y Y Y Y - - COMPx Comparator output blanking Y Y Y Y - - |
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