STM32F1 and minimum system circuit diagram

Clock, reset and power management:

2.0~3.6V power supply and IO voltage

Power-on reset, brownout reset and programmable voltage monitoring

Powerful clock system

-4~16M external high-speed crystal oscillator. The author used the Atomic Mini version STM32F103RCT6 when studying. The external crystal oscillator used is 8MHz.

-Internal 8MHz high-speed RC oscillator (used when the external high-speed crystal oscillator is broken, automatically). This function will also be mentioned in my other blog, and is generally not used.

- Internal 40KHz low speed RC oscillator for watchdog clock

-Internal phase-locked loop (PLL, frequency multiplication). Generally, the system clock is obtained by multiplying the external or internal high-speed clock by PLL (the oscillation can be multiplied from 8M to 72M)

-External low-speed 32.768K crystal oscillator, mainly used as RTC clock source

Low power consumption

Three low-power modes: sleep, stop and standby

Battery available 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)

Supported peripherals: timers, ADC, DAC, SDIO, I2S, SPI, I2C, and USART

timer

4 general timers

2 basic timers

2 advanced timers

1 system timer

2 watchdog timers

Communication interface: 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

smallest system

powered by

Powered by Vcc=3.3V, it can be converted by AMS-1117

reset

Clock: external crystal oscillator (2)

Boot startup mode selection

Download circuit (serial/JTAG/SWD)

Backup battery