Datasheet

DS9118 Rev 14 19/149
STM32F303xB STM32F303xC Functional overview
55
Figure 2. Clock tree
/32
4-32 MHz
HSE OSC
OSC_IN
OSC_OUT
OSC32_IN
OSC32_OUT
8 MHz
HSI RC
IWDGCLK
to IWDG
PLL
x2,x3,..
x16
PLLMUL
AHB
APB1
prescaler
/1,2,4,8,16
HCLK
PLLCLK
to AHB bus, core,
memory and DMA
LSE
LSI
HSI
HSI
HSE
to RTC
PLLSRC
SW
/8
SYSCLK
RTCCLK
RTCSEL[1:0]
to TIM 2,3,4,6,7
If (APB1 prescaler
=1) x1 else x2
FLITFCLK
to Flash programming interface
to I2Cx (x = 1,2)
to U(S)ARTx (x = 2..5)
LSE
HSI
SYSCLK
/2
PCLK1
SYSCLK
HSI
PCLK1
MS19989V5
to I2Sx (x = 2,3)
USBCLK
to USB interface
to cortex System timer
FHCLK Cortex free
running clock
to APB1 peripherals
AHB
prescaler
/1,2,..512
CSS
/2,/3,...
/16
LSE OSC
32.768kHz
LSI RC
40kHz
USB
prescaler
/1,1.5
APB2
prescaler
/1,2,4,8,16
to TIM 15,16,17
If (APB2 prescaler
=1) x1 else x2
to USART1
LSE
HSI
SYSCLK
PCLK2
PCLK2
to APB2 peripherals
TIM1/8
ADC
Prescaler
/1,2,4
to ADCxy
(xy = 12, 34)
ADC
Prescaler
/1,2,4,6,8,10,12,16,
32,64,128,256
I2SSRC
SYSCLK
Ext. clock
I2S_CKIN
x2
MCO
Main clock
output
/2
PLLCLK
HSI
HSE
MCO
SYSCLK
LSI
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