Chapter 16 Low-Voltage Detector; Functions Of Low-Voltage Detector; Configuration Of Low-Voltage Detector - NEC 78K0S/KA1+ User Manual

16.1 Functions of Low-Voltage Detector

The low-voltage detector (LVI) has following functions.
• Compares supply voltage (V
internal reset signal when V
• Detection levels (ten 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 14 RESET FUNCTION.

16.2 Configuration of Low-Voltage Detector

The block diagram of the low-voltage detector is shown in Figure 16-1.
V
DD
Low-voltage detection
level select register (LVIS)

CHAPTER 16 LOW-VOLTAGE DETECTOR

) and detection voltage (V
DD
< V .
DD LVI
Figure 16-1. Block Diagram of Low-Voltage Detector
V
DD
N-ch
+
−
Reference
voltage source
User's Manual U16898EJ3V0UD
), and generates an internal interrupt signal or
LVI
Low-voltage detect
register (LVIM)
Internal reset signal
INTLVI
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