STC8A8K64D4 Series Manual
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1: Make the microcontroller entering Clock stop mode / Power-Down mode / Power stop mode. CPU and all peripherals
stop working. It is cleared by hardware automatically after the microcontroller wakes up. (Note: In the clock stop mode,
the CPU and all peripherals stop working, but the data in the SRAM and XRAM remain unchanged.)
IDL: IDLE mode control bit
0: No operation.
1: Make the microcontroller entering IDLE mode. CPU stops working and all peripherals keep working. It is cleared by
hardware automatically after the microcontroller wakes up.
Note: In the power saving mode when the clock is stopped, it is not recommended to start the LVD and comparator, or
hardware system will automatically start internal high precision 1.19 V reference source which has a corresponding
temperature drift and calibration circuit, and leads to about 300uA extra power consumption. After MCU enters into the clock
stopped vibration mode, the working voltage of 3.3V only takes about 0.4uA current, so it is not recommended to open the
LVD and comparator when the MCU enters the clock stop mode. If it is really needed, it is recommended to turn on the power-
down wake-up timer. The power-down wake-up timer will only increase the power consumption of about 1.4uA, which is
acceptable for general systems. The MCU is awakened every 5 seconds by the power-down wake-up timer. After wake-up
LVD, comparator and ADC can be used to detect the external battery voltage. The detection took about 1ms. Then it enters
the clock shutdown/power-saving mode. In this way, the increased average current was less than 1uA, and the overall power
consumption was about 2.8uA (0.4uA + 1.4uA +1uA).
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