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STM32F411CC データシート(PDF) 83 Page - STMicroelectronics

部品番号 STM32F411CC
部品情報  ARM® Cortex®-M4 32b MCUFPU, 125 DMIPS, 512KB Flash, 128KB RAM, USB OTG FS, 11 TIMs, 1 ADC, 13 comm. interfaces
PDF  149 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F411CC データシート(HTML) 83 Page - STMicroelectronics

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STM32F411xC STM32F411xE
Electrical characteristics
123
Figure 22. High-speed external clock source AC timing diagram
Low-speed external user clock generated from an external source
In bypass mode the LSE oscillator is switched off and the input pin is a standard I/O. The
external clock signal has to respect the Table 53. However, the recommended clock input
waveform is shown in Figure 23.
The characteristics given in Table 36 result from tests performed using an low-speed
external clock source, and under ambient temperature and supply voltage conditions
summarized in Table 14.
Table 36. Low-speed external user clock characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fLSE_ext
User External clock source
frequency(1)
-
-
32.768
1000
kHz
VLSEH
OSC32_IN input pin high level
voltage
0.7VDD
-VDD
V
VLSEL
OSC32_IN input pin low level voltage
VSS
-0.3VDD
tw(LSEH)
tw(LSEL)
OSC32_IN high or low time(1)
450
-
-
ns
tr(LSE)
tf(LSE)
OSC32_IN rise or fall time(1)
--
50
Cin(LSE)
OSC32_IN input capacitance(1)
--
5
-
pF
DuCy(LSE) Duty cycle
-
30
-
70
%
IL
OSC32_IN Input leakage current
VSS ≤ VIN ≤ VDD
--
±1
µA
1. Guaranteed by design.



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