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Chapter 51 Low Voltage Reset/Interrupt
3.Registers
• LVSEL: Address 04C4h (Access: Byte, Halfword, Word)
(See “Meaning of Bit Attribute Symbols (Page No.10)” for details of the attributes.)
• Bit7-4: External LV detection voltage level
• Bit3-0: Internal LV detection voltage level
Note: The set level of the Internal Low Voltage Detection is only effective in case of Main Regulator is
switched off (for decreasing the trigger level when decreasing the sub regulator voltage). Otherwise (with
main regulator on) the default level is applied internally by hardware to the low voltage detection module
(the register setting is not changed in this case and will be applied next time the main regulator is switched
off).
76543210 bit
LVESEL3 LVESEL2 LVESEL1 LVESEL0 LVISEL3 LVISEL2 LVISEL1 LVISEL0
00000111
Initial value (
INIT pininput,
watchdog reset
)
X X X X XXXX
Initial value
(Software reset)
R/W R/W R/W R/W R/W R/W R/W R/W Attribute
LVESEL3-LVESEL0 Trigger level
1001 4.2V +/- 0.1V
1000 4.1V +/- 0.1V
0111 4.0V +/- 0.1V
0110 3.9V +/- 0.1V
0101 3.8V +/- 0.1V
0100 3.7V +/- 0.1V
0011 3.6V +/- 0.1V
0010 3.2V +/- 0.1V
0001 3.0V +/- 0.1V
0000 2.8V +/- 0.1V (initial)
LVISEL3-LVISEL0 Trigger level
0111 1.6V +/- 0.1V (initial)
0110 1.5V +/- 0.1V
0101 1.4V +/- 0.1V
0100 1.3V +/- 0.1V
0011 1.2V +/- 0.1V
0010 1.1V +/- 0.1V
0001 1.0V +/- 0.1V
0000 0.9V +/- 0.1V