That’s the reason, the chip stores Wi-Fi and Bluetooth connection data in RTC memory before disabling them. So, its contents are preserved during deep sleep and can be retrieved after we wake the chip up.
However, the RTC memory is kept powered on. So, everything stored in that memory is wiped out and cannot be accessed. This sleep pattern is known as ULP sensor-monitored pattern.Īlong with the CPU, the main memory of the chip is also disabled. During deep sleep mode, the main CPU is powered down, while the ULP co-processor does sensor measurements and wakes up the main system, based on the measured data from sensors.
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