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PM0222 Arkusz danych(PDF) 10 Page - STMicroelectronics

Numer części PM0222
Szczegółowy opis  Brain smart hub family
PDF  33 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0222 Arkusz danych(HTML) 10 Page - STMicroelectronics

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Clock configurations
PM0222
10/33
DocID025476 Rev 1
3.2.3
Disabling the 80 MHz RC oscillator
When the 80 MHz RC oscillator is not used by the CPU or by any peripheral for a long time,
it is recommended to power it down by setting CRMU.CCR0.ANA_PD80M to 1.
When powering down the 80 MHz RC oscillator, the software must change the CPU clock to
another source (32 kHz or external) first (CRMU.CCR0.HS_OSC_SEL = 0b01 for example),
and then execute a second CRMU register access to power down the oscillator
(CRMU.CCR0.ANA_PD80M = 1).
When powering up the 80 MHz RC oscillator, the software can power up the oscillator
(CRMU.CCR0.ANA_PD80M = 0) and change the CPU clock to the 80 MHz RC oscillator
source at the same time (CRMU.CCR0.HS_OSC_SEL = 0b00).



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