User’s Manual U16899EJ2V0UD408CHAPTER 23 LOW-VOLTAGE DETECTOR23.1 Functions of Low-Voltage DetectorThe low-voltage detector (LVI) has following functions.• Compares supply voltage (V DD) and detection voltage (V LVI ), and generates an internal interrupt signal orinternal reset signal when VDD < VLVI .• 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 ifreset occurs. For details of RESF, refer to CHAPTER 20 RESET FUNCTION.23.2 Configuration of Low-Voltage DetectorThe block diagram of the low-voltage detector is shown below.Figure 23-1. Block Diagram of Low-Voltage DetectorLVIS1 LVIS0 LVION−+ReferencevoltagesourceVDDInternal busN-chLow-voltage detection levelselection register (LVIS)Low-voltage detection register(LVIM)LVIS2LVIS3 LVIMD LVIFINTLVIInternal reset signal4VDDLow-voltage detection level selectorSelector
