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ST7MC1K2-Auto 数据表(PDF) 44 Page - STMicroelectronics

部件名 ST7MC1K2-Auto
功能描述  Clock, reset and supply management
PDF  371 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST7MC1K2-Auto 数据表(HTML) 44 Page - STMicroelectronics

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Obsolete
Product(s)
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Product(s)
Supply, reset and clock management
ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto,
44/371
6.3
Oscillator
The main clock of the ST7 can be generated by a crystal or ceramic resonator oscillator or
an external source.
The associated hardware configurations are shown in Table 6. Refer to the electrical
characteristics section for more details.
6.3.1
External clock source
In this external clock mode, a clock signal (square, sinus or triangle) with ~50% duty cycle
has to drive the OSC1 pin while the OSC2 pin is not connected.
Crystal/ceramic oscillators
This family of oscillators has the advantage of producing a very accurate rate on the main
clock of the ST7. In this mode, 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 start-up
stabilization time.
This oscillator is not stopped during the reset phase to avoid losing time in its start-up
phase. See Section 12: Electrical characteristics for more details.
Note:
When crystal oscillator is used as a clock source, a risk of failure may exist if no series
resistors are implemented.
Table 6.
ST7 clock sources
Hardware configuration
OSC1
OSC2
External
ST7
source
NC
OSC1
OSC2
Load
capacitors
ST7
CL2
CL1
Obsolete
Product(s)
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Product(s)



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