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STM32F103ZEY6XXX Datasheet(PDF) 18 Page - STMicroelectronics |
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STM32F103ZEY6XXX Datasheet(HTML) 18 Page - STMicroelectronics |
18 / 123 page Description STM32F103xC, STM32F103xD, STM32F103xE 18/123 Doc ID 14611 Rev 7 2.3.14 Low-power modes The STM32F103xC, STM32F103xD and STM32F103xE performance line supports three low-power modes to achieve the best compromise between low power consumption, short startup time and available wakeup sources: ● Sleep mode In Sleep mode, only the CPU is stopped. All peripherals continue to operate and can wake up the CPU when an interrupt/event occurs. ● Stop mode Stop mode achieves the lowest power consumption while retaining the content of SRAM and registers. All clocks in the 1.8 V domain are stopped, the PLL, the HSI RC and the HSE crystal oscillators are disabled. The voltage regulator can also be put either in normal or in low-power mode. The device can be woken up from Stop mode by any of the EXTI line. The EXTI line source can be one of the 16 external lines, the PVD output, the RTC alarm or the USB wakeup. ● Standby mode The Standby mode is used to achieve the lowest power consumption. The internal voltage regulator is switched off so that the entire 1.8 V domain is powered off. The PLL, the HSI RC and the HSE crystal oscillators are also switched off. After entering Standby mode, SRAM and register contents are lost except for registers in the Backup domain and Standby circuitry. The device exits Standby mode when an external reset (NRST pin), an IWDG reset, a rising edge on the WKUP pin, or an RTC alarm occurs. Note: The RTC, the IWDG, and the corresponding clock sources are not stopped by entering Stop or Standby mode. 2.3.15 DMA The flexible 12-channel general-purpose DMAs (7 channels for DMA1 and 5 channels for DMA2) are able to manage memory-to-memory, peripheral-to-memory and memory-to- peripheral transfers. The two DMA controllers support circular buffer management, removing the need for user code intervention when the controller reaches the end of the buffer. Each channel is connected to dedicated hardware DMA requests, with support for software trigger on each channel. Configuration is made by software and transfer sizes between source and destination are independent. The DMA can be used with the main peripherals: SPI, I2C, USART, general-purpose, basic and advanced-control timers TIMx, DAC, I2S, SDIO and ADC. 2.3.16 RTC (real-time clock) and backup registers The RTC and the backup registers are supplied through a switch that takes power either on VDD supply when present or through the VBAT pin. The backup registers are forty-two 16-bit registers used to store 84 bytes of user application data when VDD power is not present. They are not reset by a system or power reset, and they are not reset when the device wakes up from the Standby mode. The real-time clock provides a set of continuously running counters which can be used with suitable software to provide a clock calendar function, and provides an alarm interrupt and a |
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