Datasheet

DS9178 Rev 4 17/96
STM8L051F3 Functional overview
41
Figure 2. STM8L051F3 clock tree diagram
1. The HSE clock source can be either an external crystal/ceramic resonator or an external source (HSE
bypass). Refer to Section HSE clock in the STM8L050J3, STM8L051F3, STM8L052C6, STM8L052R8
MCUs and STM8L151/L152, STM8L162, STM8AL31, STM8AL3L lines reference manual (RM0031).
2. The LSE clock source can be either an external crystal/ceramic resonator or a external source (LSE
bypass). Refer to Section LSE clock in the STM8L050J3, STM8L051F3, STM8L052C6, STM8L052R8
MCUs and STM8L151/L152, STM8L162, STM8AL31, STM8AL3L lines reference manual (RM0031).
OSC_OUT
OSC_IN
HSE
HSI
LSI
LSE
LSE
LSI
HSE OSC
1-16 MHz
HSI RC
1-16 MHz
LSI RC
38 kHz
LSE OSC
32.768 kHz
OSC32_OUT
OSC32_IN
CCO
Configurable
clock output
/1;2;4;8;16;32;64
prescaler
CCO
HSE
HSI
LSI
LSE
/1;2;4;8;16;32;64
prescaler
SYSCLK
SYSCLK to core and
memory
PCLK to
peripherals
Peripheral
Clock
CLKBEEPSEL[1:0]
IWDGCLK
BEEPCLK
RTCCLK
enable (13 bits)
RTCSEL[3:0]
RTC
/1;2;4;8;16;32;64
prescaler
to
BEEP
to
IWDG
to
RTC
MS18281V2
SWIM[3:0]
CCOSEL[3:0]
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