| 摘要 |
PURPOSE:To inspect the output state at a plurality of terminals with a single terminal, by outputting multiple output terminal states at a specified terminal. CONSTITUTION:A counter LSI 1 as 16-digit decimal counter has segment output terminals Oi1-Oi4, four per digit, hence, 64 in total. The first logical circuit 6 divides the frequency of a testing pulse S1 inputted from a testing input terminal 5. The second logical circuit 7 counts clocks inputted from a clock terminal 3 to be outputted to the third logical circuits 8. The circuits 8 generates a testing output pulse according to a logical value inputted from the circuits 6 and 7. |
