Datasheet

CHAPTER 22 LOW-VOLTAGE DETECTOR
User’s Manual U18698EJ1V0UD
488
(2) Low-voltage detection level selection register (LVIS)
This register selects the low-voltage detection level.
This register can be set by a 1-bit or 8-bit memory manipulation instruction.
The generation of a reset signal other than an LVI reset clears this register to 00H.
Figure 22-3. Format of Low-Voltage Detection Level Selection Register (LVIS)
0
LVIS0
1
LVIS1
2
LVIS2
3
LVIS3
4
0
5
0
6
0
7
0
Symbol
LVIS
Address: FFBFH After reset: 00H
Note
R/W
LVIS3 LVIS2 LVIS1 LVIS0 Detection level
0 0 0 0 VLVI0 (4.24 V ±0.1 V)
0 0 0 1 VLVI1 (4.09 V ±0.1 V)
0 0 1 0 VLVI2 (3.93 V ±0.1 V)
0 0 1 1 VLVI3 (3.78 V ±0.1 V)
0 1 0 0 VLVI4 (3.62 V ±0.1 V)
0 1 0 1 VLVI5 (3.47 V ±0.1 V)
0 1 1 0 VLVI6 (3.32 V ±0.1 V)
0 1 1 1 VLVI7 (3.16 V ±0.1 V)
1 0 0 0 VLVI8 (3.01 V ±0.1 V)
1 0 0 1 VLVI9 (2.85 V ±0.1 V)
1 0 1 0 VLVI10 (2.70 V ±0.1 V)
1 0 1 1 VLVI11 (2.55 V ±0.1 V)
1 1 0 0 VLVI12 (2.39 V ±0.1 V)
1 1 0 1 VLVI13 (2.24 V ±0.1 V)
1 1 1 0 VLVI14 (2.08 V ±0.1 V)
1 1 1 1 VLVI15 (1.93 V ±0.1 V)
Note The value of LVIS is not reset but retained as is, upon a reset by LVI. It is cleared to 00H upon
other resets.
Cautions 1. Be sure to clear bits 4 to 7 to “0”.
2. Do not change the value of LVIS during LVI operation.
3. When an input voltage from the external input pin (EXLVI) is detected, the detection
voltage (V
EXLVI = 1.21 V (TYP.)) is fixed. Therefore, setting of LVIS is not necessary.