STM32F051X4 STMICROELECTRONICS [STMicroelectronics], STM32F051X4 Datasheet - Page 56
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STM32F051X4
Manufacturer Part Number
STM32F051X4
Description
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.STM32F051X4.pdf
(104 pages)
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STM32F051x
6.3.6
External clock source characteristics
High-speed external user clock generated from an external source
In bypass mode the HSE oscillator is switched off and the input pin is a standard GPIO.
The external clock signal has to respect the I/O characteristics in
the recommended clock input waveform is shown in
Table 34.
1. Guaranteed by design, not tested in production.
Figure 12. High-speed external clock source AC timing diagram
Symbol
t
t
f
w(HSEH)
V
w(HSEL)
HSE_ext
V
t
t
r(HSE)
f(HSE)
HSEH
HSEL
User external clock source
frequency
OSC_IN input pin high level voltage
OSC_IN input pin low level voltage
OSC_IN high or low time
OSC_IN rise or fall time
High-speed external user clock characteristics
Parameter
Doc ID 022265 Rev 3
(1)
Conditions
Figure
12.
0.7V
Min
V
15
Electrical characteristics
1
Section
SS
-
DD
Typ
8
-
-
-
-
6.3.13. However,
0.3V
Max
V
32
20
DD
-
DD
57/105
MHz
Unit
ns
V
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