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Chapter 24
Low-Voltage Detector
User’s Manual U16702EE3V2UD00
24.3 Registers Controlling Low-Voltage Detector
The low-voltage detector is controlled by the following registers.
•
Low-voltage detection register (LVIM)
•
Low-voltage detection level selection register (LVIS)
(1)
Low-voltage detection register (LVIM)
The LVIM register is a special register (see
3.2.3 ”Special registers” on page 70
). It is used to
enable or disable low-voltage detection and sets the operation mode of the low-voltage detector.
This register can be read or written 1-bit or 8-bit units.
Reset input clears this register to 00H.
Figure 24-2:
Low-Voltage Detection Register (LVIM) Format
Cautions: 1. LVION and LVIMD are cleared to 0 at a reset other than an LVI reset. These are not
cleared to 0 at an LVI reset.
2. After setting the LVION bit to 1, wait for 0.1ms (TYP) (target value) before
checking the voltage using the LVIF bit.
3. The value of LVIF flag is output as the interrupt request signal INTLVI when LVION
bit = 1 and LVIMD bit = 0.
4. The LVIF bit is read-only. Be sure to clear bits 2 to 6 to 0
5. To stop LVI, when using 8-bit manipulation instruction: Write 00H to LVIM.
Symbol
7
6
5
4
3
2
1
0
Address
After reset
LVIM
LVION
0
0
0
0
0
LVIMD
LVIF
FFFFF890H
00H
R/W
R/W
R
R
R
R
R
R/W
R
LVION
Enables or disables low-voltage detection operation
0
Disables operation
1
Enables operation
LVIMD
Low-voltage detection operation mode selection
0
Generates interrupt request signal INTLVI when supply voltage (V
DD
) < low-voltage detec-
tion (V
LVI
)
1
Generates internal reset signal LVIRES when supply voltage (V
DD
) < low-voltage detection
(V
LVI
)
LVIF
Low-voltage detection flag
0
When supply voltage (V
DD
) > detection voltage (V
LVI
), or when operation is disabled
1
When supply voltage (V
DD
) < detection voltage (V
LVI
)
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