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| Both sides previous revision Previous revision Next revision | Previous revision | ||
| stm32:peripherals:rtc_wakeup [2017/10/24 10:41] – [Setup wakeup timer] kjaz | stm32:peripherals:rtc_wakeup [2022/12/27 18:42] (current) – ruan | ||
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| Line 40: | Line 40: | ||
| * Program reload value in '' | * Program reload value in '' | ||
| * Enable wakeup interrupt in '' | * Enable wakeup interrupt in '' | ||
| - | * Clear any pending wakeup interrupt flag in '' | ||
| To use the wakeup interrupt, you need to configure the EXTI channel \\ | To use the wakeup interrupt, you need to configure the EXTI channel \\ | ||
| and enable it in the NVIC: | and enable it in the NVIC: | ||
| + | * Clear any pending wakeup interrupt flag in '' | ||
| * Configure the dedicated [[exti|EXTI interrupt]] channel for the RTC. \\ I.e. select edge and enable. | * Configure the dedicated [[exti|EXTI interrupt]] channel for the RTC. \\ I.e. select edge and enable. | ||
| * Enable the RTC wakeup interrupt in the [[nvic|NVIC]]. | * Enable the RTC wakeup interrupt in the [[nvic|NVIC]]. | ||
| Line 56: | Line 56: | ||
| ===== Configuration Registers ===== | ===== Configuration Registers ===== | ||
| - | ==== RTC_CR ==== | + | ==== RTC_CR |
| - | + | ||
| - | Configuration register | + | |
| \\ {{rtc_reg_cr.svg}} \\ \\ | \\ {{rtc_reg_cr.svg}} \\ \\ | ||
| Line 72: | Line 70: | ||
| |:::|1|Wake up timer interrupt enabled|| | |:::|1|Wake up timer interrupt enabled|| | ||
| - | ==== RTC_WUTR ==== | + | ==== RTC_WUTR |
| - | + | ||
| - | Wakeup timer register | + | |
| \\ {{rtc_reg_wutr.svg}} \\ \\ | \\ {{rtc_reg_wutr.svg}} \\ \\ | ||
| Line 81: | Line 77: | ||
| ===== Status Registers ===== | ===== Status Registers ===== | ||
| - | ==== RTC_ISR | + | ==== RTC_ISR |
| - | + | ||
| - | Initialization and status register | + | |
| \\ {{rtc_reg_isr.svg}} \\ \\ | \\ {{rtc_reg_isr.svg}} \\ \\ | ||
| Line 90: | Line 84: | ||
| |WUTWF*|0|Wake up timer configuration not allowed| | |WUTWF*|0|Wake up timer configuration not allowed| | ||
| |:::|1|Wake up timer configuration allowed| | |:::|1|Wake up timer configuration allowed| | ||
| + | |WUTF||Wake up timer flag is set by hardware when wakeup counter reaches 0 and cleared by software by writing 0.|| | ||
| * This bit is set, after the WUTE bit (control register) has been set to 0, and reset by hardware. | * This bit is set, after the WUTE bit (control register) has been set to 0, and reset by hardware. | ||
| + | |||
| + | ===== Back domain control register ===== | ||
| + | |||
| + | ==== RCC_BDCR - Back domain control register ==== | ||
| + | |||
| + | \\ {{rcc_reg_bdcr.svg}} \\ \\ | ||
| + | |||
| + | |< 100% 5em 5em >| | ||
| + | |RTCEN*|0|RTC clock disabled| | ||
| + | |:::|1|RTC clock enabled| | ||
| + | |RTCSEL|00|No clock| | ||
| + | |:::|01|LSE oscillator clock used as the RTC clock| | ||
| + | |:::|10|LSI oscillator clock used as the RTC clock| | ||
| + | |:::|11|HSE oscillator clock divided by a programmable prescaler(selection Through RTCPRE[4:0] bits in the RCC clock configuration register (RCC_CFGR)) used as the RTC clock| | ||
| + | |||