STM32F328C8 datasheet(23/109 Pages) STMICROELECTRONICS

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STM32F328C8

Functional overview

The RTC is an independent BCD timer/counter. It supports the following features:

•

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

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

•

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

used to enhance the calendar precision.

•

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

•

Two programmable alarms with wake up from Stop mode capability.

•

On-the-fly correction from 1 to 32767 RTC clock pulses. This can be used to

synchronize it with a master clock.

•

Digital calibration circuit with 1 ppm resolution, to compensate for quartz crystal

inaccuracy.

•

Two anti-tamper detection pins with programmable filter. The MCU can be woken up

from Stop mode on tamper event detection.

•

Timestamp feature which can be used to save the calendar content. This function can

be triggered by an event on the timestamp pin, or by a tamper event. The MCU can be

woken up from Stop mode on timestamp event detection.

•

17-bit Auto-reload counter for periodic interrupt with wakeup from STOP capability.

The RTC clock sources can be:

•

A 32.768 kHz external crystal

•

A resonator or oscillator

•

The internal low-power RC oscillator (typical frequency of 40 kHz)

•

The high-speed external clock divided by 32.

3.16

Communication interfaces

3.16.1

Inter-integrated circuit interface (I2C)

The devices feature an I2C bus interface which can operate in multimaster and slave mode.

It can support standard (up to 100 kHz), fast (up to 400 kHz) and fast mode + (up to 1 MHz)

modes.

It supports 7-bit and 10-bit addressing modes, multiple 7-bit slave addresses (2 addresses,

1 with configurable mask). It also includes programmable analog and digital noise filters.

Table 5. Comparison of I2C analog and digital filters

Analog filter

Digital filter

Pulse width of

suppressed spikes

≥ 50 ns

Programmable length from 1 to 15

I2C peripheral clocks

Benefits

Available in Stop mode

1. Extra filtering capability vs.

standard requirements.

2. Stable length

Drawbacks

Variations depending on

temperature, voltage, process

Wakeup from Stop on address

match is not available when digital

filter is enabled.

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