STM32F303C8 datasheet(25/115 Pages) STMICROELECTRONICS

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STM32F303x6/x8

Functional overview

woken up from Stop and Standby modes on timestamp event detection.

•

17-bit Auto-reload counter for periodic interrupt with wakeup from STOP/STANDBY

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.

In addition, it provides hardware support for SMBUS 2.0 and PMBUS 1.1: ARP capability,

Host notify protocol, hardware CRC (PEC) generation/verification, timeouts verifications and

ALERT protocol management. It also has a clock domain independent from the CPU clock,

allowing the I2C1 to wake up the MCU from Stop mode on address match.

The I2C interface can be served by the DMA controller.

The features available in I2C1 are showed below in Table 7.

Table 6. 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.

Table 7. STM32F303x6/8 I2C implementation

I2C features(1)

I2C1

7-bit addressing mode

10-bit addressing mode

Standard mode (up to 100 kbit/s)

Fast mode (up to 400 kbit/s)

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