Chapter 22 Low-Voltage Detector; Functions Of Low-Voltage Detector; Configuration Of Low-Voltage Detector - NEC 78K0/KD1 Series User Manual

8-bit single-chip microcontrollers
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22.1 Functions of Low-Voltage Detector

The low-voltage detector (LVI) has following functions.
• Compares supply voltage (V
internal reset signal when V
• Detection levels (seven 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 19 RESET FUNCTION.

22.2 Configuration of Low-Voltage Detector

The block diagram of the low-voltage detector is shown below.
V
DD
370

CHAPTER 22 LOW-VOLTAGE DETECTOR

) and detection voltage (V
DD
< V
.
DD
LVI
Figure 22-1. Block Diagram of Low-Voltage Detector
V
DD
N-ch
+
Detection
voltage source
(V
)
LVI
Low-voltage detection level
selection register (LVIS)
Internal bus
Preliminary User's Manual U16315EJ1V0UD
), and generates an internal interrupt signal or
LVI
Internal reset signal
INTLVI
Low-voltage detection register
(LVIM)

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