ST STM32F2 User Manual

UM1940
HAL RCC Generic Driver
DocID028236 Rev 2
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system clock source after
startup from Reset, wake-up
from STOP and STANDBY
mode, or in case of failure of the
HSE used directly or indirectly
as system clock (if the Clock
Security System CSS is
enabled). HSI can not be
stopped if it is used as system
clock source. In this case, you
have to select another source of
the system clock then stop the
HSI. After enabling the HSI, the
application software should wait
on HSIRDY flag to be set
indicating that HSI clock is
stable and can be used as
system clock source. This
parameter can be: ENABLE or
DISABLE. When the HSI is
stopped, HSIRDY flag goes low
after 6 HSI oscillator clock
cycles.
__HAL_RCC_HSI_DISABLE
__HAL_RCC_HSI_CALIBRATIONVALUE_ADJUS
T
Description:
Macro to adjust the Internal High
Speed oscillator (HSI)
calibration value.
Parameters:
__HSICalibrationValue__:
specifies the calibration
trimming value. (default is
RCC_HSICALIBRATION_DEFA
ULT). This parameter must be a
number between 0 and 0x1F.
Notes:
The calibration is used to
compensate for the variations in
voltage and temperature that
influence the frequency of the
internal HSI RC.
RTC Clock Configuration
__HAL_RCC_RTC_ENABLE
Notes:
These macros must be used only after the
RTC clock source was selected.
__HAL_RCC_RTC_DISABLE

ST STM32F2 Specifications

General

Brand	ST
Model	STM32F2
Category	Microcontrollers
Language	English