UPD78F0411GA-GAM-AX Datasheet, PDF (490/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 22 LOW-VOLTAGE DETECTOR
(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)
Address: FFBFH After reset: 00H^Note R/W
Symbol
7
6
5
4
LVIS
0
0
0
0
3
LVIS3
2
LVIS2
1
LVIS1
0
LVIS0
LVIS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
LVIS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
LVIS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
LVIS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Detection level
VLVI0 (4.24 V ±0.1 V)
VLVI1 (4.09 V ±0.1 V)
VLVI2 (3.93 V ±0.1 V)
VLVI3 (3.78 V ±0.1 V)
VLVI4 (3.62 V ±0.1 V)
VLVI5 (3.47 V ±0.1 V)
VLVI6 (3.32 V ±0.1 V)
VLVI7 (3.16 V ±0.1 V)
VLVI8 (3.01 V ±0.1 V)
VLVI9 (2.85 V ±0.1 V)
VLVI10 (2.70 V ±0.1 V)
VLVI11 (2.55 V ±0.1 V)
VLVI12 (2.39 V ±0.1 V)
VLVI13 (2.24 V ±0.1 V)
VLVI14 (2.08 V ±0.1 V)
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 (VEXLVI = 1.21 V (TYP.)) is fixed. Therefore, setting of LVIS is not necessary.
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User’s Manual U18698EJ1V0UD