PRIVATE LINE SELECTION CIRCUIT FOR DIGITAL KEY-PHONE SYSTEM

摘要

the first decoding part(6) outputting a latch enable signal to address data; the first latch part(7) latching data to control each peripheral event performed at a certain address; the second latch part(8) latching data to control each peripheral event performed at a certain address by receiving the signal of the first decoding part; the third latch part(9) latching data to control each peripheral event; the second decoding part(10) outputting the decoding value needed in a key-scanning; the first buffer(11) receiving the key data value; and the second buffer(12) maintaining the decoding value.