Panasonic KX-TD7895 - Digital Spread Spedtrum Telephone, Service Manual

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STANDBY TALK
[Normal]
IC105(41) L
H
IC107(46) L L
[Auto
Answer]
IC105(41) L H
IC107(46) L
L
IC113(4) (OR)
H : Hook (OFF Hook)
7.1.8. RESET CIRCUIT
This circuit is used for transmission of a reset pulse to the CPU(IC107). Reset pulse is Low.
7.1.9. DATA COMMUNICATION CIRCUIT
FUNCTION
The data communication circuit serves the following function (in the EMSS mode):Information
exchanger between the EMSS and Base Unit, key input information as well as data for the LED
control, etc. this information is continuously exchanged at all times.
CIRCUIT OPERATION
When the Base Unit receives an IRQ signal from the EMSS and after sending the key input
information (19 pulses) to the EMSS and receiving data (47 pulses) for LED control, etc. the