Datasheet

Functional overview STM32F334x4 STM32F334x6 STM32F334x8
18/121 DocID025409 Rev 8
Figure 2. Clock tree
MS31933V5
/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
MCO
Main clock
output
AHB
/2
PLLCLK
HSI
HSE
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
MCO
/8
SYSCLK
RTCCLK
RTCSEL[1:0]
SYSCLK
to TIM 2, 3, 6, 7
If (APB1 prescaler
=1) x1 else x2
FLITFCLK
to Flash programming interface
LSI
to I2C1
to USARTx (x = 1, 2, 3)
LSE
HSI
SYSCLK
/2
PCLK1
SYSCLK
HSI
PCLK1
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
APB2
prescaler
/1,2,4,8,16
to TIM 15,16,17
If (APB2 prescaler
=1) x1 else x2
PCLK2
to APB2 peripherals
TIM1/
HRTIM1
ADC
Prescaler
/1,2,4
to ADCx
(x = 1, 2)
ADC
Prescaler
/1,2,4,6,8,10,12,16,
32,64,128,256
x2
/1,2,4,
...128
MCOPRE
PLLNODIV
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