KX-NT551RU-B - Panasonic Telephone Service Manual (repair manual). Page 13

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13
  KX-NT551RU/KX-NT551RU-B
KEY Input control timing chart
KEYIN pins have a internal pull-down resistor.
If KEY is pushed, high level is latched by connecting STB(output high) and KEYIN. If not, low level is latched.
The value is fixed by reading twice. 
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