STM32F302XB Datasheet, PDF (18/133 Pages) STMicroelectronics – ARM Cortex-M4F 32b MCU+FPU, up to 256KB Flash+48KB SRAM

Functional overview
Figure 3. Clock tree
STM32F302xx/STM32F303xx
HSI
SYSCLK
FLITFCLK
to Flash programming interface
to I2Cx (x = 1,2)
I2S_CKIN
I2SSRC
SYSCLK
Ext. clock
to I2Sx (x = 2,3)
OSC_OUT
OSC_IN
OSC32_IN
OSC32_OUT
MCO
8 MHz ^HSI
HSI RC
/2
PLLSRC
PLLMUL
SW
HSI
PLL _PLLCLK
x2,x3,..
x16
HSE
/2,/3,...
/16
CSS
AHABHB
prescaler
/1,2,..512
SYSCLK
4-32 MHz
HSE OSC
/32
LSE OSC
32.768kHz LSE
RTCCLK _{to RTC}
RTCSEL[1:0]
LSI RC
LSI
40kHz
IWDGCLK
to IWDG
Main clock ^/2
output
MCO
PLLCLK
HSI
LSI
HSE
SYSCLK
USB
prescaler
/1,1.5
USBCLK
to USB interface
HCLK
/8
APB1
prescaler
/1,2,4,8,16
PCLK1
to AHB bus, core,
memory and DMA
to cortex System timer
FHCLK Cortex free
running clock
to APB1 peripherals
If (APB1 prescaler
=1) x1 else x2
to TIM 2,3,4,6,7
PCLK1
SYSCLK
HSI
LSE
to U(S)ARTx (x = 2..5)
APB2
prescaler
/1,2,4,8,16
PCLK2
to APB2 peripherals
If (APB2 prescaler
=1) x1 else x2
PCLK2
SYSCLK
HSI
LSE
to TIM 15,16,17
to USART1
x2
TIM1/8
ADC
Prescaler
/1,2,4
ADC
Prescaler
/1,2,4,6,8,10,12,16,
32,64,128,256
to ADCxy
(xy = 12, 34)
MS19989V4
18/133
Doc ID 023353 Rev 5