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Mikas Longbardi
Mikas Longbardi
Associate III
November 24, 2017
Question

F446RC RTC le' bug minimal!

  • November 24, 2017
  • 1 reply
  • 560 views
Posted on November 24, 2017 at 02:59

On F446RC, sysreset does not put bit 19 into default setting of 0, its stuck on 1 if 1 is written previously.

Procedure to set and clear bit:

RTC->CR = (0<<19);   //Clear bit19, 512hz mode

RTC->CR = (1<<19);   //Set bit19, 1hz mode
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    1 reply

    waclawek.jan
    waclawek.jan
    Super User
    November 24, 2017
    Posted on November 24, 2017 at 10:14

    This is the correct behaviour, as RCC_CR is in the backup domain - read 6.1.3  Backup domain reset and the RCC_CR description in RCC registers chapter.

    JW

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