104 lines
6.2 KiB
Markdown
104 lines
6.2 KiB
Markdown
# STM32L476-Nucleo BSP Introduction
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[中文](README_zh.md)
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## MCU: STM32L476RG @80MHz, 1024KB FLASH, 128KB RAM
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The STM32L476xx devices are the ultra-low-power microcontrollers based on the high-performance Arm® Cortex®-M4 32-bit RISC core operating at a frequency of up to 80 MHz. The Cortex-M4 core features a Floating point unit (FPU) single precision which supports all Arm® single-precision data-processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) which enhances application security.
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The STM32L476xx devices embed high-speed memories (Flash memory up to 1 Mbyte, up to 128 Kbyte of SRAM), a flexible external memory controller (FSMC) for static memories (for devices with packages of 100 pins and more), a Quad SPI flash memories interface (available on all packages) and an extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix.
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The STM32L476xx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, proprietary code readout protection and Firewall.
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The devices offer up to three fast 12-bit ADCs (5 Msps), two comparators, two operational amplifiers, two DAC channels, an internal voltage reference buffer, a low-power RTC, two general-purpose 32-bit timer, two 16-bit PWM timers dedicated to motor control, seven general-purpose 16-bit timers, and two 16-bit low-power timers. The devices support four digital filters for external sigma delta modulators (DFSDM).
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In addition, up to 24 capacitive sensing channels are available. The devices also embed an integrated LCD driver 8x40 or 4x44, with internal step-up converter.
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They also feature standard and advanced communication interfaces.
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The STM32L476xx operates in the -40 to +85 °C (+105 °C junction), -40 to +105 °C (+125 °C junction) and -40 to +125 °C (+130 °C junction) temperature ranges from a 1.71 to 3.6 V VDD power supply when using internal LDO regulator and a 1.05 to 1.32V VDD12 power supply when using external SMPS supply. A comprehensive set of power-saving modes allows the design of low-power applications.
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Some independent power supplies are supported: analog independent supply input for ADC, DAC, OPAMPs and comparators, 3.3 V dedicated supply input for USB and up to 14 I/Os can be supplied independently down to 1.08V. A VBAT input allows to backup the RTC and backup registers. Dedicated VDD12 power supplies can be used to bypass the internal LDO regulator when connected to an external SMPS.
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The STM32L476xx family offers six packages from 64-pin to 144-pin packages.
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#### KEY FEATURES
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- Ultra-low-power with FlexPowerControl
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- 1.71 V to 3.6 V power supply
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- -40 °C to 85/105/125 °C temperature range
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- 300 nA in VBAT mode: supply for RTC and 32x32-bit backup registers
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- 30 nA Shutdown mode (5 wakeup pins)
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- 120 nA Standby mode (5 wakeup pins)
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- 420 nA Standby mode with RTC
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- 1.1 μA Stop 2 mode, 1.4 μA with RTC
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- 100 μA/MHz run mode (LDO Mode)
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- 39 μA/MHz run mode (@3.3 V SMPS Mode)
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- Batch acquisition mode (BAM)
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- 4 μs wakeup from Stop mode
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- Brown out reset (BOR)
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- Interconnect matrix
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- Core: Arm® 32-bit Cortex®-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator™) allowing 0-wait-state execution from Flash memory, frequency up to 80 MHz, MPU, 100DMIPS and DSP instructions
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- Performance benchmark
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- 1.25 DMIPS/MHz (Drystone 2.1)
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- 273.55 CoreMark® (3.42 CoreMark/MHz @ 80 MHz)
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- Energy benchmark
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- 294 ULPMark™ CP score
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- 106 ULPMark™ PP score
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- Clock Sources
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- 4 to 48 MHz crystal oscillator
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- 32 kHz crystal oscillator for RTC (LSE)
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- Internal 16 MHz factory-trimmed RC (±1%)
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- Internal low-power 32 kHz RC (±5%)
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- Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)
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- 3 PLLs for system clock, USB, audio, ADC
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- Up to 114 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V
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- RTC with HW calendar, alarms and calibration
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- LCD 8× 40 or 4× 44 with step-up converter
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- Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
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- 16x timers: 2x 16-bit advanced motor-control, 2x 32-bit and 5x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer
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- Memories
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- Up to 1 MB Flash, 2 banks read-while-write, proprietary code readout protection
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- Up to 128 KB of SRAM including 32 KB with hardware parity check
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- External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories
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- Quad SPI memory interface
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- 4x digital filters for sigma delta modulator
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- Rich analog peripherals (independent supply)
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- 3x 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling, 200 μA/Msps
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- 2x 12-bit DAC output channels, low-power sample and hold
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- 2x operational amplifiers with built-in PGA
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- 2x ultra-low-power comparators
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- 20x communication interfaces
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- USB OTG 2.0 full-speed, LPM and BCD
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- 2x SAIs (serial audio interface)
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- 3x I2C FM+(1 Mbit/s), SMBus/PMBus
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- 5x USARTs (ISO 7816, LIN, IrDA, modem)
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- 1x LPUART (Stop 2 wake-up)
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- 3x SPIs (and 1x Quad SPI)
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- CAN (2.0B Active) and SDMMC interface
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- SWPMI single wire protocol master I/F
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- IRTIM (Infrared interface)
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- 14-channel DMA controller
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- True random number generator
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- CRC calculation unit, 96-bit unique ID
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- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
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- All packages are ECOPACK2® compliant
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## Read more
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| Documents | Description |
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| :----------------------------------------------------------: | :----------------------------------------------------------: |
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| [STM32_Nucleo-64_BSP_Introduction](../docs/STM32_Nucleo-64_BSP_Introduction.md) | How to run RT-Thread on STM32 Nucleo-64 boards (**Must-Read**) |
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| [STM32L476RG ST Official Website](https://www.st.com/en/microcontrollers-microprocessors/stm32l476rg.html#documentation) | STM32L476RG datasheet and other resources |
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## Maintained By
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<gycgwzw@gmail.com>
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## Translated By
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Meco Man @ RT-Thread Community
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> jiantingman@foxmail.com
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>
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> https://github.com/mysterywolf |