Circuit Operations; Key Input Control Circuit - Panasonic KX-T7730X Service Manual

KX-T7730X

7 CIRCUIT OPERATIONS

7.1.

KEY INPUT CONTROL CIRCUIT

Sequential input information is executed by dynamic scanning.
The ports R20~R23, R30, R31 of IC1 are brought to high status consecutively.
If a key is pressed, the key-in information input is executed by ports R00~R03, R10~R13.
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