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STM32F031X4 Datasheet(PDF) 19 Page - STMicroelectronics |
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STM32F031X4 Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 106 page  DocID025743 Rev 4 19/106 STM32F031x4 STM32F031x6 Functional overview 22 3.11.5 SysTick timer This timer is dedicated to real-time operating systems, but could also be used as a standard down counter. It features: • a 24-bit down counter • autoreload capability • maskable system interrupt generation when the counter reaches 0 • programmable clock source (HCLK or HCLK/8) 3.12 Real-time clock (RTC) and backup registers The RTC and the five backup registers are supplied through a switch that takes power either on VDD supply when present or through the VBAT pin. The backup registers are five 32-bit registers used to store 20 bytes of user application data when VDD power is not present. They are not reset by a system or power reset, or at wake up from Standby mode. The RTC is an independent BCD timer/counter. Its main features are the following: • calendar with subseconds, 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 day of the month • programmable alarm with wake up from Stop and Standby mode capability • on-the-fly correction from 1 to 32767 RTC clock pulses. This can be used to synchronize the RTC 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 and Standby modes 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 and Standby modes on timestamp event detection • reference clock detection: a more precise second source clock (50 or 60 Hz) can be used to enhance the calendar precision 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 3.13 Inter-integrated circuit interface (I2C) The I2C interface (I2C1) can operate in multimaster or slave modes. It can support Standard mode (up to 100 kbit/s), Fast mode (up to 400 kbit/s) and Fast Mode Plus (up to 1 Mbit/s) with 20 mA output drive. It supports 7-bit and 10-bit addressing modes, multiple 7-bit slave addresses (two addresses, one with configurable mask). It also includes programmable analog and digital noise filters. |
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