Fujitsu FR81S User Manual
CHAPTER 31: LOW-VOLTAGE DETECTION (INTERNAL
LOW-VOLTAGE DETECTION)
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER :
INTERNAL LOW-VOLTAGE DETECTION (INTERNAL POWER SUPPLY
LOW-VOLTAGE
DETECTION)
FUJITSU SEMICONDUCTOR CONFIDENTIAL
8
[bit3] LVD_OE (Low Voltage Detect power fall Output Enable)
This bit enables the output of the signal when a fall of the internal power supply voltage is detected.
LVD_OE
Internal voltage fall detection output
enable setting
0
Enable
1
Disable
*This bit is initialized by only power-on reset.
[bit2, bit1] Reserved
[bit0] LVD_F (Low Voltage Detect power fall Flag) : Internal low-voltage detection flag
[bit0] LVD_F (Low Voltage Detect power fall Flag) : Internal low-voltage detection flag
This bit indicates an internal power supply voltage fall detection flag.
LVD_F
Internal power supply fall detection flag
Read
Write
0
Not detected
Clear the flag
1
Detected
No effect on operation
If a power-on reset or a drop in the internal power supply voltage is detected, the LVD_F bit is set to "1".
It will be initialized only when the external reset is input.
MB91520 Series
MN705-00010-1v0-E
1149