Preliminary User’s Manual U17260EJ3V1UD
536
CHAPTER 24 LOW-VOLTAGE DETECTOR
24.1 Functions of Low-Voltage Detector
The low-voltage detector (LVI) has the following functions.
•
Compares supply voltage (V
DD
) and detection voltage (V
LVI
), and generates an internal interrupt signal or
internal reset signal when V
DD
< V
LVI
. Detection levels (16 levels) of supply voltage can be changed by software.
•
Compares a voltage input from an external input pin (EXLVI) with the detection voltage (V
EXLVI
= 1.21 V (TYP.)),
and generates an internal interrupt signal or internal reset signal when EXLVI < V
EXLVI
.
•
The supply voltage (V
DD
) or voltage input from an external input pin (EXLVI) can be selected 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, see
CHAPTER 22 RESET FUNCTION
.
24.2 Configuration of Low-Voltage Detector
The block diagram of the low-voltage detector is shown in Figure 24-1.
Figure 24-1. Block Diagram of Low-Voltage Detector
LVIS1 LVIS0
LVION
−
+
Reference
voltage
source
V
DD
Internal bus
N-ch
Low-voltage detection level
selection register (LVIS)
Low-voltage detection register
(LVIM)
LVIS2
LVIS3
LVIF
INTLVI
Internal reset signal
4
LVISEL
EXLVI/P120/
INTP0
Содержание 78K/0 Series
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