Datasheet

78K0/Kx2-L CHAPTER 22 LOW-VOLTAGE DETECTOR
R01UH0028EJ0400 Rev.4.00 677
Sep 27, 2010
(2) Used as interrupt (LVIMD = 0)
• If LVISEL = 0, compares the supply voltage (VDD) and LVI detection voltage (VLVI). When VDD drops lower than
V
LVI (VDD < VLVI) or when VDD becomes VLVI or higher (VDD ≥ VLVI), generates an interrupt signal (INTLVI).
• If LVISEL = 1, compares the input voltage from external input pin (EXLVI) and LVI detection voltage (V
EXLVI = 1.21
V ±0.1 V). When EXLVI drops lower than VEXLVI (EXLVI < VEXLVI) or when EXLVI becomes VEXLVI or higher (EXLVI
≥ V
EXLVI), generates an interrupt signal (INTLVI).
While the low-voltage detector is operating, whether the supply voltage or the input voltage from an external input pin is
more than or less than the detection level can be checked by reading the low-voltage detection flag (LVIF: bit 0 of LVIM).
Remarks 1. Level detection of input voltage from external input pin (EXLVI) is available only in 78K0/KB2-L and
78K0/KC2-L.
2. LVIMD: Bit 1 of low-voltage detection register (LVIM)
LVISEL: Bit 2 of LVIM