STM32F1 and minimum system circuit diagram

Test - lowercase jpg

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

Clock, reset and power management:
2.0~3.6V power supply and IO voltage power-on reset, power-down reset and programmable voltage monitoring powerful clock system
-4~16M external high-speed crystal oscillator, the Mini version of the atom used by the author to learn STM32F103RCT6, the external crystal oscillator is 8MHz
- Internal 8MHz high-speed RC oscillator (used when the external high-speed crystal oscillator is broken, automatic) This role will also be covered in my other blog, which is generally not used.
- Internal 40KHz low speed RC oscillator for watchdog clock
- Internal phase-locked loop (PLL, multiplier), the general system clock is obtained by external or internal high-speed clock after PLL multiplication (can oscillate 8M to 72M)
- External low-speed 32.768K crystal oscillator, mainly for RTC clock source Low-power sleep, stop and standby three low-power modes can be used to power RTC and backup registers
AD
3 12-bit AD, 21 external measurement channels
DA
2 12-bit DA
DMA
12 DMA channels (7+5=12; 7-channel DMA1, 5-channel DMA2)
Support peripherals: timer, ADC, DAC, SDIO, I2S, SPI, I2C, and USART
Timer
4 general purpose timers
2 basic timers
2 advanced timers
1 system timer
2 watchdog timer communication interfaces: up to 13 communication interfaces
2 I2C interfaces
5 serial ports (3 USART and 2 UART)
3 SPI interfaces
1 CAN2.0
1 USB FS
1 SDIO
Internal structure

The minimum system power supply is powered by Vcc=3.3V, which can be converted and reset by AMS-1117.

Clock: external crystal (2)

Boot startup mode selection

Download circuit (serial/JTAG/SWD)

Backup battery