Circuit Operations - Panasonic KX-T7730CA Service Manual

KX-T7730CA
4.2.

Circuit Operations

4.2.1. 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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