Fujitsu FR81S User Manual
CHAPTER 31: LOW-VOLTAGE DETECTION (INTERNAL
LOW-VOLTAGE DETECTION)
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER :
INTERNAL LOW-VOLTAGE DETECTION (INTERNAL POWER SUPPLY
LOW-VOLTAGE
DETECTION)
FUJITSU SEMICONDUCTOR CONFIDENTIAL
10
5.1. Internal Low-voltage Detection
The internal low-voltage detection is explained.
The internal low-voltage detection is the function that monitors an internal power supply voltage and
detects it falling below the detection voltage level. When the internal low-voltage below the detection level
is detected, a detection flag is set and a reset signal to initialize setting is generated.
If the internal power supply voltage falls below the detection voltage level, it takes the oscillation
stabilization wait time after the internal low-voltage detection voltage is recovered. For details, see
"CHAPTER: RESET".
Oscillation stabilization wait time
2
15
× Main clock cycle
MB91520 Series
MN705-00010-1v0-E
1151