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Real-time clock (RTC)

UM1581

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DocID023800 Rev 1

 #define: RTC_OutputPolarity_Low ((uint32_t)0x00100000)

RTC_Output_selection_Definitions

 #define: RTC_Output_Disable ((uint32_t)0x00000000)

 #define: RTC_Output_AlarmA ((uint32_t)0x00200000)

 #define: RTC_Output_AlarmB ((uint32_t)0x00400000)

 #define: RTC_Output_WakeUp ((uint32_t)0x00600000)

RTC_Output_Type_ALARM_OUT

 #define: RTC_OutputType_OpenDrain ((uint32_t)0x00000000)

 #define: RTC_OutputType_PushPull ((uint32_t)0x00040000)

RTC_Smooth_calib_period_Definitions

 #define: RTC_SmoothCalibPeriod_32sec ((uint32_t)0x00000000)

if RTCCLK = 32768 Hz, Smooth calibation period is 32s, else 2exp20 RTCCLK seconds

 #define: RTC_SmoothCalibPeriod_16sec ((uint32_t)0x00002000)

if RTCCLK = 32768 Hz, Smooth calibation period is 16s, else 2exp19 RTCCLK seconds

 #define: RTC_SmoothCalibPeriod_8sec ((uint32_t)0x00004000)

if RTCCLK = 32768 Hz, Smooth calibation period is 8s, else 2exp18 RTCCLK seconds

RTC_Smooth_calib_Plus_pulses_Definitions

 #define: RTC_SmoothCalibPlusPulses_Set ((uint32_t)0x00008000)

The number of RTCCLK pulses added during a X -second window = Y - CALM[8:0]. with Y

= 512, 256, 128 when X = 32, 16, 8

ST STM32F31xx User Manual

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