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STM32W108HB Datasheet(PDF) 49 Page - STMicroelectronics

Part # STM32W108HB
Description  High-performance, IEEE 802.15.4 wireless system-on-chip with up to 256 Kbytes of embedded Flash memory
PDF  278 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32W108HB Datasheet(HTML) 49 Page - STMicroelectronics

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ
System modules
Doc ID 16252 Rev 14
49/278
6.3
Clocks
The STM32W108 integrates four oscillators:
●
High frequency RC oscillator (HSI)
●
24 MHz crystal oscillator (HSE)
●
10 kHz LSI RC oscillator (LSI10K)
●
32.768 kHz crystal oscillator (LSE)
Note:
The LSI1K clock is generated from the 10 kHz LSI RC oscillator (LSI10K). The default value
is a divide by 10 for a nominal 1 kHz output clock.
Figure 7 shows a block diagram of the clocks in the STM32W108. This simplified view
shows all the clock sources and the general areas of the chip to which they are routed.
Figure 7.
Clocks block diagram
PCLK
LSE OSC
Produces 6MHz
or 1MHz
SCLK
LSI10K
LSI1K
oscillator
Failover monitor
(selects RC when
XTAL fails )
HSI
HSE OSC
FCLK
CPU
bus
RAM CTRL
RAM
bus
FLITF
Flash
CLK_HSECR2_SW1
SysTick_CTRL_CLKSOURCE
SLPTMR _CR_CLKSEL
CoreDebug_DEMCR_TRCENA
TIM_SMCR_SMS[2:0]
TIM2_OR_EXTRIGSEL[1:0]
TIMxCLK
digital in
12 MHz
HSI RC
24 MHz
HSE OSC
10 kHz
LSI RC
32 kHz
digital in
/2
/2
/(2^N)
oscillator
CLK_SLEEPCR_LSEEN
32 kHz
LSE OSC
MAC Timer
counter
SCx
RATEGEN
SysTick
counter
TIMx
counter
ADC
SigmaDelta
Sleep Timer
counter
Watchdog
counter
AND
TRACECLK
digital out
SCxSCLK
digital i /o
/N
(nominal 10)
SLPTMR_CR_PSC[7:4]
ADC_CR_CLK
CLK_HSECR2_EN
CLK_CR2_SW2



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