Fujitsu FR81S User Manual
CHAPTER 31: LOW-VOLTAGE DETECTION (INTERNAL
LOW-VOLTAGE DETECTION)
1. Overview
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER :
INTERNAL LOW-VOLTAGE DETECTION (INTERNAL POWER SUPPLY
LOW-VOLTAGE
DETECTION)
FUJITSU SEMICONDUCTOR CONFIDENTIAL
3
1. Overview
This section gives an overview of the internal low-voltage detection (internal power supply
low-voltage detection).
The internal power supply low-voltage detection is the function that monitors an internal power supply voltage
and detects it falling below the low-voltage detection voltage level. When the internal low-voltage below the
detection voltage level is detected, a detection flag is set and the device goes to the reset state by the low-voltage
detection reset.
Figure 1-1 Block Diagram (Overview)
Voltage Detection circuit
Internal power supply low-voltage
detection reset factor
detection reset factor
LVDV
±
0.1V
(To Reset control circuit)
MB91520 Series
MN705-00010-1v0-E
1144