| 摘要 |
PURPOSE:To reduce the number of wirings and enlarge degree of freedom of wiring by providing various controlling circuits of a TV receiver on the same IC, attaching them to a controlling panel and making connection of this and a microcomputer by a serial bus line. CONSTITUTION:A key matrix circuit 30 consists of key switches 301-3016, and scaning signals (a)-(d) from a key scan circuit 11 structured to an IC10 and signals (e)-(h) corresponding to a closed key are added to a key record circuit 12. A display drive circuit 20 is an output circuit for displaying channel etc. and has display output (i)-(n) corresponding to a display element 40. Data for display are given from a microcomputer for central controlling. The IC10 and microcomputer are connected through serial bus lines (q), (r), and data transfer to data registers (1)-(3) is carried out through an input/output circuit 15 structured in the IC10. |
