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Chapter 1 Overview
Precautions
1-6-3 Power Supply
The Relation between Power Supply and Input Pin Voltage
Input pin voltage should be supplied only after power supply is on. If the input pin voltage is applied
supplies before power supply is on, a latch up occurs and causes the destruction of micro controller by a
large current flow.
The Relation between Power Supply and Reset Input Voltage
After power supply is on, reset pin voltage should be low for sufficient time, ts, before rising , in order to
be recognized as a reset signal.
Figure 1-6-5 Power Supply and Reset Input Voltage
Figure 1-6-4 Power Supply and Input Pin Voltage
Power voltage
Reset Input Voltage
Time
t
Reset pin
low level
0
Voltage
ts
Input
Input protection resistance
(V
DD
)
Forward current generates
P
N
[ Chapter 2. 2-8 Reset ]