Datasheet
STM32F103xF, STM32F103xG Electrical characteristics
Doc ID 16554 Rev 3 55/120
Figure 18. High-speed external clock source AC timing diagram
Figure 19. Low-speed external clock source AC timing diagram
ai14143
OSC _I N
EXTERNAL
STM32F103xx
CLOCK SO URC E
V
HSEH
t
f(HSE)
t
W(HSE)
I
L
90%
10%
T
HSE
t
t
r(HSE)
t
W(HSE)
f
HSE_ext
V
HSEL
ai14144b
OSC32_IN
EXTERNAL
STM32F103xx
CLOCK SO URC 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