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STM32F372R8 데이터시트(PDF) 71 Page - STMicroelectronics

부품명 STM32F372R8
상세설명  ARM Cortex-M4F 32b MCUFPU, up to 256KB Flash32KB SRAM timers
PDF  128 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STM32F372R8 데이터시트(HTML) 71 Page - STMicroelectronics

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STM32F37x
Electrical characteristics
Doc ID 022691 Rev 3
71/128
Figure 12.
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 GPIO.
The external clock signal has to respect the I/O characteristics in Section 6.3.14. However,
the recommended clock input waveform is shown in Figure 13.
Table 39.
Low-speed external user clock characteristics
Symbol
Parameter(1)
1.
Guaranteed by design, not tested in production.
Conditions
Min
Typ
Max
Unit
fLSE_ext
User External clock source
frequency
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
450
ns
tr(LSE)
tf(LSE)
OSC32_IN rise or fall time
50



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