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AN2021 bảng dữ liệu(PDF) 20 Page - STMicroelectronics

tên linh kiện AN2021
Giải thích chi tiết về linh kiện  The ST10F272B and ST10F272E are members of the STMicroelectronics
PDF  39 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2021 bảng dữ liệu(HTML) 20 Page - STMicroelectronics

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Modified features
AN2021
20/39
1.9.1
Hardware impact
Port0 configuration might be changed with regards to the new PLL factor.
All configurations need a crystal (or ceramic resonator) to generate the CPU clock through
the internal oscillator amplifier, except for the Direct Drive mode (oscillator amplifier
disabled, so no crystal or resonator can be used). Vice versa, the clock can be forced
through an external clock source only in Direct Drive mode.
The components on XTAL1 and XTAL2 (crystal and capacitors, or resonator) must be
changed as:
●
the input frequency range is now reduced
●
it is no longer possible to use a crystal or a ceramic resonator in direct drive mode
●
it is no longer possible to use a PLL factor with a frequency generator
●
the electrical characteristics of the main oscillator have changed (transconductance)
1.9.2
Software impact
None.



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