Understand the MCU block diagram and intuitively understand the device configuration and working principle

1. Overview of core modules of MCU block diagram

1. Core configuration

• CPU core: Architecture (such as Cortex‑M3/M4/M7), number of cores, main frequency
• memory: Flash (program), RAM (operation), EEPROM/non-volatile storage
• I/O port: GPIO quantity, driving capability, multiplexing function

2. Standard peripherals

• Timer/Counter (TIM)
• Communication interface: UART, SPI, I²C, CAN, USB, Ethernet, etc.
• Analog peripherals: ADC, DAC
• Interrupt controller, internal temperature sensor

3. Power and clock

• Power management: operating voltage, low power mode (sleep/stop/standby)
• Clock system: internal RC, external crystal oscillator, PLL, frequency divider

4. Special function module

• Watchdog (IWDG/WWDG)
• real time clock RTC
• Hardware encryption, security modules, etc.

2. Example: STM32F103C8T6 block diagram interpretation

• Kernel: ARM Cortex‑M3, up to72MHz
• storage：128KB Flash + 20KB SRAM
• Power supply：2.0V–3.6V
• peripherals：
  • 4 general purpose timers (TIM1‑TIM4)
  • 2-channel 12-bit ADC
  • 5 groups of GPIOs
  • I²C、SPI、CAN、USB 2.0
  • Built-in temperature sensor

3. Understand the actual value of block diagrams

• Quick selection: Determine at a glance whether resources meet project requirements
• Understand signal flow: The complete path of peripherals→kernel→output is clearly visible
• Efficient debugging: Quickly locate connection and configuration problems when peripherals are abnormal.
• Fault location: Check the modules one by one according to the block diagram to shorten the maintenance cycle.
• Technical exchange: Common technical language for team communication and new employee training

4. The significance of distribution and domestic substitution

• assist customersSolution selection and substitution
• Quick matchPin to Pin compatible, peripheral compatibleMaterial
• Improve design-in success rate and form technical barriers in fierce competition