Häufig gestellte Fragen
- M051-Base-Serie(95)
- M0518-Serie(97)
- M0519-Serie(43)
- M0564-Serie(1)
- Mini51-Base-Serie(90)
- Nano100/102-Base-Serie(101)
- Nano103-Base-Serie(10)
- Nano110/112-LCD-Serie(100)
- Nano120-USB-Serie(111)
- Nano130-Advanced-Serie(110)
- NUC029-Serie(94)
- NUC100/200-Advanced-Serie(102)
- NUC120/122/123/220-USB-Serie(116)
- NUC121/125-Serie(1)
- NUC126-USB-Serie(2)
- NUC130/230-CAN-Serie(103)
- NUC131-NUC1311-CAN-Serie(98)
- NUC140/240-Konnektivität-Serie(114)
常见问答
In the M451 series, why the read RTC_TIME and RTC_CAL values are incorrect after VDD is powered on when VBAT and VDD are powered independently? 日付:2016-06-27
Since VBAT and VDD are powered independently, the across power domain and synchronization issue exists. If RTC_TIME and RTC_CAL registers are read immediately after power on, the RTC_TIME and RTC_CAL values may be incorrect.
This is because both the RTC_TIME and RTC_CAL registers are triggered and updated by the RTC Counter. Please refer to the following figure. The RTC Counter is updated once per second.
Thus, to solve the power-on synchronization issue, wait a second, until the RTC Counter updates RTC_TIME and RTC_CAL, and then read the value of the register.

| 製品: | マイクロコントローラ ,Arm Cortex-M4 MCU ,M451 Base シリーズ ,M452 USB シリーズ ,M453 CAN シリーズ |
|---|---|
| アプリケーション: | |
| 機能: | Peripherals,Timer and PWM,RTC |