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STM32F405RGT6STM32L051C8T6

STM32F405RGT6STM32L051C8T6

内容简介

ach channel is connected to dedicated hardware DMA requests, with support for softwaretrigger0n each channel. Configuration is made by software and transfer sizes betweensource an...

  • 型号:STM32L051C8T6
  • 供货量:99999PCS
  • 品牌:st
  • 发货地:广东深圳
  • 发货期:1-3天
  • 价格:¥5.6元/PCS

详细内容

ach channel is connected to dedicated hardware DMA requests, with support for software
trigger0n each channel. Configuration is made by software and transfer sizes between
source and destination are independent.
The DMA can be used with the main peripherals: SPI, I2C, USART, general purpose timers
TIMx and ADC.
2.3.14
RTC (real-time clock) and backup registers
The RTC and the backup registers are supplied through a switch that takes power either0n
VDD supply when present or through the VBAT pin. The backup registers are ten 16-bit
registers used to store 20 bytes of user application data when VDD power is not present.
The real-time clock provides a set of continuously running counters which can be used with
suitable software to provide a clock calendar function, and provides an alarm interrupt and a
periodic interrupt. It is clocked by a 32.768 kHz external crystal, resonator or oscillator, the
internal low power RC oscillator or the high-speed external clock divided by 128. The
internal low power RC has a typical frequency of 40 kHz. The RTC can be calibrated using
an external 512 Hz output to compensate for any natural crystal deviation. The RTC
features a 32-bit programmable counter for long term measurement using the Compare
register to generate an alarm. A 20-bit prescaler is used for the time base clock and is by
default configured to generate a time base of 1 second from a clock at 32.768 kHz

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