| 摘要 |
PURPOSE:To trace an even which occurs plural times and to facilitate and speed up a maintenance diagnosis of a device to be observed and debugging, by constituting a storage circuit into plural banks. CONSTITUTION:When a trace start signal 121 from an external device is detected, a control circuit 120 updates the contents of an address register 150 and also writes status information on the observed device in an address of the storage circuit 130 specified by address registers 150 and 160 every time a trace condition detecting circuit 110 detects trace condition. When a stop condition detecting circuit 100 receives an external input signal 101 and detects such condition that tracing operation is completed in the bank and tracing operation in another bank is started, a control circuit 120 updates the contents of an adddress register 160 immediately. Thus, banks are switched every time the stop condition is generated to perform the tracing operation. |
