| 摘要 |
PURPOSE: A method of controlling multiple output points of the switch of a fluorescent lamp or a neon sign and a circuit thereof are provided to easily expand the output points while reducing the number of external ROMs and simplifying the Mi-com program. CONSTITUTION: In the switching circuit having a timer, an address decoder and a ROM, the low bits A0 and A1 of the address decoder are connected to the high bits A11 and A12 of the ROM address respectively. The bits of A2 to A12 of the address decoder are connected to the bits of A0 to A10 of the ROM address. Now, the 8-bit ROM can store 32 bits of data. Here, corresponding to the status of A0 and A1, the outputs are produced in sequence from A. ROM(1-8 output), B. ROM(9-16 output), C. ROM(17-24 output) and D. ROM(25-32 output) and the address value rises by one automatically and repeats the operation. And the Mi-com reads data among A. B. C. and D. ROM responding to the status of A0 and A1 and produces the 32 bits of data at a set timing.
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