S3F80P5_UM_ REV1.00 RESET
INTERNAL POWER-ON RESET
The power-on reset circuit is built on the S3F80P5 product. When power is initially applied to the MCU, or when
VDD drops below the VPOR, the POR circuit holds the MCU in reset until VDD has risen above the VLVD level.
Normal Operating Mode
V
DD
V
LVD
t
WAIT
V
POR
Internal
RESET
Release
Reset
Pulse
Figure 8-4. Timing Diagram for Internal Power-On Reset Circuit
8-5