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R01UH0336EJ0102 Rev.1.02
Page 286 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 8 Reset Controller
8.2.2
Low-Voltage Indicator (LVI)
The low-voltage indicator circuit (LVI) permanently compares the power supply
voltage VDD for the internal regulator with the LVI internal reference voltage
V
LVI
.
If VDD falls below the internal reference voltage (VDD < V
LVI
), the internal
reset signal LVIRES or the interrupt signal INTLVI is generated.
Additionally, the LVIRES flag RESF.RESF0 is set.
RESF.RESF0 is not automatically cleared, if VDD exceeds V
LVI
. It is cleared by
• setting RESFC.RESFC0 = 1
• SYSRES
LVI reference
voltage
For the specification of the internal reference voltage (V
LVI
), refer to Section
27.6.16, POF/LVI Characteristics.
Generation of
LVIRES
The generation of an interrupt instead of LVIRES is selectable.
The following figure shows the timing of LVIRES and changes to
RESF.RESF0.
Figure 8-2
LVI Reset Timing
Delay
A delay time is induced between VDD crossing the V
LVI
level and assertion of
LVIRES setting of RESF.RESF0.
Time
Delay
RESFC.RESFC0 = 1
RESFC.RESFC0 = 1
VDD
V
LVI
RESF.RESF0
LVIRES