Hi ppbinhminh, Did you have debugger attached? When it is connected and the device enters Deep Standby Mode, the connection may be lost. So after leaving this mode you may not see the application stopping at breakpoints. To be sure that the device enters low power mode properly, MCU power consumption can be measured. Please refer to section 3.3. of the PK-S5D9 User's Manual: www.renesas.com/.../r12um0009eu0101-synergy-pk-s5d9.pdf Regards, adboc
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