| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that, when the signal in an integrated circuit desired to be confirmed is outputted in order to confirm the function of the circuit from an external terminal, even if there are many signals desired to be confirmed, a generally used necessary terminal can not be cut down to turn them into confirming signal output terminals since the integrated circuit is limited to the number of terminals given by its sealing package, so that monitor output terminals are cut down instead. SOLUTION: The signal monitor of the integrated circuit 1 for monitoring the signal of an integrated circuit for a specific use is equipped with a means 7 for once holding a monitor signal 101, a parallel/serial converter means 9 for subjecting the monitor signal 101 to parallel/serial conversion when there is a change in the monitor signal, a monitor signal change detection part 6, a counter part 8, one serial data output terminal 10 for outputting the monitor signal 101 through the parallel/serial converter means 9, one converting clock output terminal 11 for outputting the control clock 31 of a conversion clock for the inverse conversion of the parallel/serial conversion and a serial/parallel converter means 15.
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