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23.1 Functions of Low-Voltage Detector
The low-voltage detector (LVI) has following functions.
• Compares supply voltage (V
internal reset signal when V
• Detection levels (nine levels) of supply voltage can be changed by software.
• Interrupt or reset function can be selected by software.
• Operable in STOP mode.
When the low-voltage detector is used to reset, bit 0 (LVIRF) of the reset control flag register (RESF) is set to 1 if
reset occurs. For details of RESF, refer to CHAPTER 20 RESET FUNCTION.
23.2 Configuration of Low-Voltage Detector
The block diagram of the low-voltage detector is shown below.
V
DD
Low-voltage detection level
selection register (LVIS)
408
CHAPTER 23 LOW-VOLTAGE DETECTOR
) and detection voltage (V
DD
< V
.
DD
LVI
Figure 23-1. Block Diagram of Low-Voltage Detector
V
DD
N-ch
+
−
Reference
voltage
source
Internal bus
User's Manual U16899EJ2V0UD
), and generates an internal interrupt signal or
LVI
Low-voltage detection register
(LVIM)
Internal reset signal
INTLVI
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