Datasheet

78K0/Kx2-L CHAPTER 22 LOW-VOLTAGE DETECTOR
R01UH0028EJ0400 Rev.4.00 675
Sep 27, 2010
(2) Low-voltage detection level select 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.
Reset signal generation input sets this register to 00H.
Figure 22-3. Format of Low-Voltage Detection Level Select 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 (4.22 ±0.1 V)
0 0 0 1 VLVI1 (4.07 ±0.1 V)
0 0 1 0 VLVI2 (3.92 ±0.1 V)
0 0 1 1 VLVI3 (3.76 ±0.1 V)
0 1 0 0 VLVI4 (3.61 ±0.1 V)
0 1 0 1 VLVI5 (3.45 ±0.1 V)
0 1 1 0 VLVI6 (3.30 ±0.1 V)
0 1 1 1 VLVI7 (3.15 ±0.1 V)
1 0 0 0 VLVI8 (2.99 ±0.1 V)
1 0 0 1 VLVI9 (2.84 ±0.1 V)
1 0 1 0 VLVI10 (2.68 ±0.1 V)
1 0 1 1 VLVI11 (2.53 ±0.1 V)
1 1 0 0 VLVI12 (2.38 ±0.1 V)
1 1 0 1 VLVI13 (2.22 ±0.1 V)
1 1 1 0 VLVI14 (2.07 ±0.07 V)
1 1 1 1 VLVI15 (1.91 ±0.1 V)
Note The reset value changes depending on the reset source.
If the LVIS register is reset by LVI resets (except resets by the LVI default start function), it is not reset but
holds the current value. The value of this register is reset to “00H” by 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.
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