STM32F103xC, STM32F103xD, STM32F103xE Electrical characteristics
Doc ID 14611 Rev 8 57/130
Figure 21. Low-speed external clock source AC timing diagram
ai14144b
OSC32_IN
EXTERNAL
STM32F103xx
CLOCK SOURC E
V
LSEH
t
f(LSE)
t
W(LSE)
I
L
90%
10%
T
LSE
t
t
r(LSE)
t
W(LSE)
f
LSE_ext
V
LSEL
