upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 782

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

24.3 Registers Controlling Low-Voltage Detector
The low-voltage detector is controlled by the following registers.
(1)
Cautions: 1. LVION and LVIMD are cleared to 0 at a reset other than an LVI reset. These are not
782
Symbol
LVIM
R/W
• Low-voltage detection register (LVIM)
• Low-voltage detection level selection register (LVIS)
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.
LVIMD
LVION
LVIF
0
1
0
1
0
1
2. After setting the LVION bit to 1, wait for 0.1ms (TYP) (target value) before
3.
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.
LVION
R/W
7
cleared to 0 at an LVI reset.
checking the voltage using the LVIF bit.
bit = 1 and LVIMD bit = 0.
The value of LVIF flag is output as the interrupt request signal INTLVI when LVION
Disables operation
Enables operation
Generates interrupt request signal INTLVI when supply voltage (V
tion (V
Generates internal reset signal LVIRES when supply voltage (V
(V
When supply voltage (V
When supply voltage (V
LVI
Figure 24-2: Low-Voltage Detection Register (LVIM) Format
)
LVI
R
6
0
)
R
5
0
Chapter 24 Low-Voltage Detector
Enables or disables low-voltage detection operation
Low-voltage detection operation mode selection
User’s Manual U16702EE3V2UD00
DD
DD
R
4
0
) > detection voltage (V
) < detection voltage (V
Low-voltage detection flag
R
3
0
R
2
0
LVI
LVI
LVIMD
R/W
), or when operation is disabled
)
1
LVIF
R
0
DD
DD
) < low-voltage detection
) < low-voltage detec-
FFFFF890H
Address
After reset
00H