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Questions and Answers
Which core peripheral is responsible for managing system-level control and power modes?
Which core peripheral is responsible for managing system-level control and power modes?
- DMA
- NVIC
- RCC
- SCB (correct)
What type of reset is triggered by the external reset pin (NRST)?
What type of reset is triggered by the external reset pin (NRST)?
- Power reset
- Backup domain reset
- System reset (correct)
- Low-power management reset
Which reset type sets all registers to their reset values except for the Backup domain register?
Which reset type sets all registers to their reset values except for the Backup domain register?
- Power reset (correct)
- Low-power management reset
- Backup domain reset
- System reset
What is the main function of the DMA in STM32 core peripherals?
What is the main function of the DMA in STM32 core peripherals?
Which watchdog operates independently of the main system processor?
Which watchdog operates independently of the main system processor?
What is the method used to trigger a software reset in the backup domain control of RCC?
What is the method used to trigger a software reset in the backup domain control of RCC?
Which clock option operates at a frequency of 8 MHz and is an internal oscillator?
Which clock option operates at a frequency of 8 MHz and is an internal oscillator?
What frequency range is supported by the HSE oscillator when using an external crystal?
What frequency range is supported by the HSE oscillator when using an external crystal?
How does the PLL clock operate with the HSI clock?
How does the PLL clock operate with the HSI clock?
What is the purpose of the RCC_CR register?
What is the purpose of the RCC_CR register?
Which clock signal is characterized by its 40 kHz frequency and is used internally?
Which clock signal is characterized by its 40 kHz frequency and is used internally?
What register contains the reload value for the SysTick timer?
What register contains the reload value for the SysTick timer?
Which bit in the SysTick control and status register (STK_CTRL) is used to indicate if the SysTick timer is currently counting?
Which bit in the SysTick control and status register (STK_CTRL) is used to indicate if the SysTick timer is currently counting?
What is a characteristic of the HSE oscillator when using an external source?
What is a characteristic of the HSE oscillator when using an external source?
What should be done after selecting a clock other than HSI for the system clock (SYSCLK)?
What should be done after selecting a clock other than HSI for the system clock (SYSCLK)?
Flashcards
RCC
RCC
Reset and Clock control in STM32, managing system clocks and resets.
NVIC
NVIC
Nested Vectored Interrupt Controller, manages interrupt prioritization and handling.
SYSTICK
SYSTICK
A 24-bit timer in STM32 for interrupts and timing control.
System Reset
System Reset
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Backup Domain Reset
Backup Domain Reset
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Software Reset
Software Reset
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VDD
VDD
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HSI Clock
HSI Clock
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HSE Clock
HSE Clock
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PLL Clock
PLL Clock
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LSI Clock
LSI Clock
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LSE Clock
LSE Clock
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SYSCLK
SYSCLK
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RCC Registers
RCC Registers
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RCC_BDCR
RCC_BDCR
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Study Notes
STM32 Core Peripherals
- STM32 microcontrollers have core peripherals that manage various functionalities
- RCC (Reset and Clock Control): Manages system clocks, resets, and peripheral clock control.
- NVIC (Nested Vectored Interrupt Controller): Manages interrupt prioritization and handling.
- SYSTICK: A 24-bit system timer for interrupts and timing control.
- SCB (System Control Block): Manages system-level control, exceptions, and power modes.
- DMA (Direct Memory Access): Allows accessing memory directly, independent of the processor.
- WWDG (Window Watchdog): A window-based watchdog.
- IWDG (Independent Watchdog): An independent watchdog.
RCC (Reset and Clock Control)
- RCC manages system clocks, resets, and peripheral clock control
- The RCC manages various reset types
- System reset: triggered by an external reset (NRST pin)
- WWDG and IWDG end-of-count conditions
- Software reset enabled in SCB
- Low-power management reset (occurs when entering standby or stop mode). These resets are controlled by bits in user option bytes.
- RCC controls different clock sources:
- HSI (High-speed internal oscillator): 8 MHz, used directly as system clock or as PLL input. Faster and cost-effective, but less accurate
- HSE (High-speed external oscillator): External crystal or ceramic resonator. Up to 50 MHz (bypass mode); 3-25 MHz (crystal/resonator) is more accurate, but slower startup.
- PLL (Phase-locked loop): Frequency multiplication using HSI or HSE as input.
- 40 kHz low-speed internal RC (LSI): For timing peripherals.
- 32.768 kHz low-speed external crystal (LSE): For real-time clock.
SYSTICK
- SYSTICK is a 24-bit timer
- Its clock source can be AHB/8 (9 MHz) or AHB (72 MHz)
- SYSTICK reload register (STK_LOAD) controls the reload value.
- SYSTICK current value register (STK_VAL) tracks the current value of the timer.
- SYSTICK control and status register (STK_CTRL) controls and monitors the timer.
Resources
- Various PDFs (RM0008.PDF, pm0214-stm32-cortexm4-mcus-and-mpus-programming-manual-stmicroelectronics.pdf) are available as resources.
- Videos by Eng. Ahmed El are also suggested learning aids.
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