This paper introduces a caller ID display that uses the AT89C52 single-chip microcomputer to receive and display the caller ID of a phone. The display receives the caller ID information transmitted by frequency shift keying (FSK) when the called party is on-hook, and can display the caller ID number, call date, time and other information, and can store up to 120 caller ID information. Users can easily view or delete the caller ID information by using the up and down keys and the delete key.
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