Chapter 16
Appendix
Cautions for Circuit Setup XVI - 5
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.
Figure:16.1.5 Power Supply and Input Pin Voltage
■ 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.
Figure:16.1.6 Power Supply and Reset Input Voltage
Input
Input protection resister
(power supply V
DD)
Generation of foward current
P
N
Time required to properly recognize voltage level as reset
Time
t
0
Supply voltage
Reset input voltage
Reset pin
at low level
below input voltage
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