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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3133 датащи(PDF) 18 Page - STMicroelectronics |
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AN3133 датащи(HTML) 18 Page - STMicroelectronics |
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18 / 43 page  Programming the RTC AN3133 18/43 Doc ID 16956 Rev 5 2.3 Programming the Auto-wakeup unit Table 6 describes the steps required to configure the Auto-wakeup unit. Table 6. Steps to configure the Auto wake-up unit Step What to do How to do it Comments 1 Disable the wakeup timer. Clear WUTE bit in RTC_CR2 register. 2 Ensure access to Wakeup auto-reload counter and bits WUCKSEL[2:0] is allowed. Poll WUTWF until it is set in RTC_ISR1. It takes approximately 2 RTCCLK clock cycles. 3 Program the value into the wakeup timer. Set RTC_WUTRL and RTC_WUTRH. See Section 3.4: Maximum and minimum RTC wakeup period. 4 Select the desired clock source. Program WUCKSEL[2:0] bits in RTC_CR1 register. 5 Re-enable the wakeup timer. Set WUTE bit in RTC_CR2 register. The wakeup timer restarts down-counting. |
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