Datasheet

V850ES/JG3 CHAPTER 24 LOW-VOLTAGE DETECTOR (LVI)
R01UH0015EJ0300 Rev.3.00 Page 707 of 870
Sep 30, 2010
CHAPTER 24 LOW-VOLTAGE DETECTOR (LVI)
24.1 Functions
The low-voltage detector (LVI) has the following functions.
• If the interrupt occurrence at low voltage detection is selected, the low-voltage detector continuously compares the
supply voltage (V
DD) and the detected voltage (VLVI), and generates an internal interrupt signal when the supply
voltage drops or rises across the detected voltage.
• If the reset occurrence at low voltage detection is selected, the low-voltage detector generates an interrupt reset
signal when the supply voltage (V
DD) drops across the detected voltage (VLVI).
• Interrupt or reset signal can be selected by software.
• Can operate in STOP mode.
If the low-voltage detector is used to generate a reset signal, the RESF.LVIRF bit is set to 1 when the reset signal is
generated. For details of RESF register, see 22.2 Registers to Check Reset Source.
24.2 Configuration
The block diagram of the low-voltage detector is shown below.
Figure 24-1. Block Diagram of Low-Voltage Detector
LVIS0
LVION
Detected voltage
source (V
LVI )
V DD
V DD
INTLVI
Internal bus
N-ch
Low-voltage detection level
select register (LVIS)
Low-voltage detection
register (LVIM)
LVIMD
LVIF
Internal reset signal
Selector
Low-
voltage
detection
level
selector
−
+