IPC/RSL8xxx-XxxxE: user documentation
DOC/IPC_RSL8-E; V1.9
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3.3.14.
Power Fail
In power fail mode the microcontroller monitors the external power fail signal. The state of
power fail signal can be access through the status register, I/O 8200h.
Application example
Fig. 8 Typical power fail application
The application has to poll the power fail flag and call different functions according to the state
of the flag.
Fig. 9 Typical power fail flow
Power Supplies
System
PCU
power on/off
power fail
UPS
power fail
DC
status register
I/O 8200h
Power Fail
Flag set?
do power fail stuff
Start
do some work
no
End
yes