STM32G030F6 datasheet(25/94 Pages) STMICROELECTRONICS

25 / 94 page

DS12991 Rev 1

25/94

STM32G030x6/x8

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

•

Two anti-tamper detection pins with programmable filter

•

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

timestamp pin, a tamper event or by switching to VBAT mode

•

17-bit auto-reload wakeup timer (WUT) for periodic events, with programmable

resolution and period

•

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

When clocked by LSE, the RTC operates in VBAT mode and in all low-power modes. When

clocked by LSI, the RTC does not operate in VBAT mode, but it does in low-power modes.

All RTC events (Alarm, WakeUp Timer, Timestamp or Tamper) can generate an interrupt

and wake the device up from the low-power modes.

The backup registers allow keeping 20 bytes of user application data in the event of VDD

failure, if a valid backup supply voltage is provided on VBAT pin. They are not affected by

the system reset, power reset, and upon the device’s wakeup from Standby mode.

3.17

Inter-integrated circuit interface (I2C)

The device embeds two I2C peripherals. 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.

STM32G030F6 Datasheet(PDF) 25 Page - STMicroelectronics

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