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STM32F405XX Datasheet(PDF) 30 Page - STMicroelectronics |
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STM32F405XX Datasheet(HTML) 30 Page - STMicroelectronics |
30 / 185 page Description STM32F405xx, STM32F407xx 30/185 DocID022152 Rev 4 Standby mode, the SRAM and register contents are lost except for registers in the backup domain and the backup SRAM when selected. The device exits the Standby mode when an external reset (NRST pin), an IWDG reset, a rising edge on the WKUP pin, or an RTC alarm / wakeup / tamper /time stamp event occurs. The standby mode is not supported when the embedded voltage regulator is bypassed and the V 12 domain is controlled by an external power. 2.2.20 VBAT operation The VBAT pin allows to power the device VBAT domain from an external battery, an external supercapacitor, or from VDD when no external battery and an external supercapacitor are present. VBAT operation is activated when VDD is not present. The VBAT pin supplies the RTC, the backup registers and the backup SRAM. Note: When the microcontroller is supplied from VBAT, external interrupts and RTC alarm/events do not exit it from VBAT operation. When PDR_ON pin is not connected to VDD (internal reset OFF), the VBAT functionality is no more available and VBAT pin should be connected to VDD. 2.2.21 Timers and watchdogs The STM32F405xx and STM32F407xx devices include two advanced-control timers, eight general-purpose timers, two basic timers and two watchdog timers. All timer counters can be frozen in debug mode. Table 4 compares the features of the advanced-control, general-purpose and basic timers. Table 4. Timer feature comparison Timer type Timer Counter resolutio n Counter type Prescaler factor DMA request generatio n Capture/ compare channels Complementar y output Max interface clock (MHz) Max timer clock (MHz) Advanced -control TIM1, TIM8 16-bit Up, Down, Up/dow n Any integer between 1 and 65536 Yes 4 Yes 84 168 |
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Similar Description - STM32F405XX_13 |
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