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16.1.3
Power Supply
The Relation between Power Supply and Input Pin Voltage
Input pin voltage should be supplied only after power supply is on. If this order is reversed, the destruction of
microcontroller by a large current flow could be occurred.
The Relation between Power Supply and Reset Input Voltage
After power supply is on, reset pin voltage should be low for sufficient time before rising, in order to be recog-
nized as a reset signal.
Reset pin
at low level
below input voltage
Input
Generation of foward current
Figure:16.1.5 Power Supply and Input Pin Voltage
0
Time required to properly recognize voltage level as reset
Figure:16.1.6 Power Supply and Reset Input Voltage
Input protection resister
P
N
(power supply V
Supply voltage
Reset input voltage
Time
)
DD
t
Cautions for Circuit Setup
Chapter 16
Appendix
XVI - 5
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