Preliminary
SN8P1702A/SN8P1703A
8-bit micro-controller build-in 12-bit ADC
EXTERNAL RESET DESCRIPTION
The external reset is a low level active device. The reset pin receives the low voltage and resets the system. When the
voltage detects high level, it stops resetting the system. Users can use an external reset circuit to control system
operation. It is necessary that the VDD must be stable.
VDD
External Reset
External Reset Detect Level
Internal Reset Signal
System Reset
End of External Reset
Figure 6-2 External Reset Timing Diagram
Users must to be sure the VDD stable earlier than external reset (Figure 5-2) or the external reset will fail. The external
reset circuit is a simple RC circuit as following.
R
VDD
20K ohm
RST
C
MCU
0.1uF
VSS
VCC
GND
Figure 6-3. External Reset Circuit
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