
Electrical characteristics
Figure 11. High-speed external clock source AC timing diagram
STM32F103xx
VHSEH
VHSEL
90%
10%
tr(HSE)
tf(HSE)
THSE
EXTER NAL
fHSE_ext
CLOCK SOURC E
OSC _IN
tW(HSE)
IL
STM32F103xx
Figure 12. Low-speed external clock source AC timing diagram
tW(HSE) t
ai14143
VLSEH
VLSEL
90%
10%
tr(LSE)
tf(LSE)
TLSE
EXTER NAL
CLOCK SOURC E
fLSE_ext
OSC32_IN
tW(LSE)
tW(LSE) t
IL
STM32F103xx
ai14144b
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