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Text excerpt from page 30 (click to view)
KX-TSC11AGW
14.3.2. Initializing Circuit 14.3.2.1. Function
This circuit is used to initialize the CPU when the batteries are installed.
14.3.2.2. Circuit operation
When the batteries are inserted into the unit, then the voltage is regulated by IC302 and power is supplied to the CPU. The unit starts operating soon after the voltage goes beyond point A in the voltage diagram.