CD00161566 Datasheet, PDF (52/105 Pages) STMicroelectronics – nullMedium-density performance line ARM-based 32-bit MCU

Electrical characteristics
STM32F103x8, STM32F103xB
Figure 22. High-speed external clock source AC timing diagram
VH_SEH
VH_SEL
90%
10%
tr(H_SE)
tf(H_SE)
TH_SE
tW(H_SE)
tW(H_SE) t
EXTER NAL
fH_{SE_ext}
CLOCK SOURC E
OSC _IN
IL
STM32F103xx
ai14143
Figure 23. Low-speed external clock source AC timing diagram
VL_SEH
VL_SEL
90%
10%
tr(L_SE)
tf(L_SE)
TL_SE
tW(L_SE)
tW(L_SE) t
EXTER NAL
CLOCK SOURC E
fL_{SE_ext}
OSC32_IN
IL
STM32F103xx
ai14144b
High-speed external clock generated from a crystal/ceramic resonator
The high-speed external (HSE) clock can be supplied with a 4 to 16 MHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on
characterization results obtained with typical external components specified in Table 22. In
the application, the resonator and the load capacitors have to be placed as close as
possible to the oscillator pins in order to minimize output distortion and startup stabilization
time. Refer to the crystal resonator manufacturer for more details on the resonator
characteristics (frequency, package, accuracy).
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