| 摘要 |
PURPOSE:To observe the internal signal of an information processor in real time without complicating a system by providing a selective means which selects a part of plural internal signals according to a selective signal and outputs it to an outside. CONSTITUTION:An internal signal output circuit(ISO) 2 is provided on a microcomputer 1. The ISO 2 is a circuit to output a part of an internal bus 120 and an internal control bus 123 to the outside, and is connected to the internal bus 120 and the internal control bus 123. The ISO 2 selects three signals out of 24 internal signals and outputs them to the outside. The output of three signals is decided by inputting the selective signal from the outside. All the internal signals can be observed in real time by taking out three signals that is a part of the 24 internal signals to the outside, installing eight computers 1, and setting three selective signals with different values. |
