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CHAPTER 24 STANDBY FUNCTION
User’s Manual U12697EJ3V0UM
Figure 24-13. Flow to Restore Main System Clock Operation
Switch to the main power supply.
Write STBC = 70H
Has the oscillation
stabilization time elapsed?
Write STBC = 00H
End
NO
YES
Operating with the backup power supply
Execute the instruction that starts the main system clock.
Software wait
Execute the instruction that switches to the main system clock.
Normal operation using the subsystem clock
Figure 24-14. Timing for Restoring Main System Clock Operation
Main system clock
Subsystem clock
System clock
STBC
CST bit
74H
70H
Oscillation stabilization time
00H
Switch to main system clock
Main power supply
Backup power
supply
Power supply
24.7.3 Standby function in low power consumption mode
The standby function in the low power consumption mode has a HALT mode and an IDLE mode.
