STM32C011F6U6 datasheet(23/94 Pages) STMICROELECTRONICS

23 / 94 page

DS13866 Rev 3

23/94

STM32C011x4/x6

Functional overview

Features of the RTC:

•

Calendar with subsecond, seconds, minutes, hours (12 or 24 format), week day, date,

month, year, in BCD (binary-coded decimal) format

•

Automatic correction for 28, 29 (leap year), 30, and 31 days of the month

•

Programmable alarm

•

On-the-fly correction from 1 to 32767 RTC clock pulses, usable for synchronization with

a master clock

•

Reference clock detection - a more precise second-source clock (50 or 60 Hz) can be

used to improve the calendar precision

•

Digital calibration circuit with 0.95 ppm resolution, to compensate for quartz crystal

inaccuracy

•

Timestamp feature to save a calendar snapshot, triggered by an event on the

timestamp pin

•

Multiple clock sources and references:

–

a 32.768 kHz external crystal (LSE)

–

an external resonator or oscillator (LSE)

–

the internal low-power RC oscillator (LSI, with typical frequency of 32 kHz)

–

the high-speed external clock (HSE) divided by 32

The RTC operates in Run, Sleep, and Stop mode.

RTC events (Alarm, Timestamp) can generate an interrupt and wake the device up from the

low-power modes.

3.17

Inter-integrated circuit interface (I2C)

The device embeds one I2C peripheral. Refer to Table 8 for the features.

The I2C-bus interface handles communication between the microcontroller and the serial

I2C-bus. It controls all I2C-bus-specific sequencing, protocol, arbitration and timing.

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