NOTE
This flag (LVDF/LVWF) gets cleared on reset. The flag is only
valid after the device has come out of the reset, at which point
the flag will be set accordingly to the voltage level. If supply
level is higher than LVD/LVW threshold then this flag stay
cleared, else this flag gets set.
27.5.1 Low Voltage Reset (LVR) Operation
If the supply voltage falls below the reset trip point (V
LVR
), a system reset will be
generated.
If PMC_LVDSC1[LVDRE] is set and the supply voltage falls below V
LVD
, a system
reset will be generated.
PMC_LVDSC1[LVDF] will be cleared by system reset, so after recovery
PMC_LVDSC1[LVDF] will read zero. Usage of PMC_LVDSC1[LVDF] is intended for
LVD interrupt opteration only (for example, PMC_LVDSC1[LVDIE] = 1 and
PMC_LVDSC1[LVDRE] = 0).
27.5.2 LVD Interrupt Operation
By configuring the LVD circuit for interrupt operation (LVDIE set),
PMC_LVDSC1[LVDF] is set and an LVD interrupt request occurs upon detection of a
low voltage condition. The LVDF bit is cleared by writing one to the
PMC_LVDSC1[LVDACK] bit, when the supply returns to above the trip point.
27.5.3 Low-voltage warning (LVW) interrupt operation
The LVD system contains a low-voltage warning flag (LVWF) to indicate that the supply
voltage is approaching, but is above, the LVD voltage. The LVW also has an interrupt,
which is enabled by setting the PMC_LVDSC2[LVWIE] bit. If enabled, an LVW
interrupt request occurs when the LVWF is set. LVWF is cleared by writing one to the
PMC_LVDSC2[LVWACK] bit, when the supply returns to above the trip point.
Chapter 27 Power Management Controller (PMC)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
685
Содержание KE1xF Series
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