| 摘要 |
PURPOSE:To perform the program debug with high efficiency by always monitoring the address bus information and detecting the abnormality of a program if produced to record automatically the run history of the program. CONSTITUTION:An address bus monitor circuit 3 monitors the address bus information and the memory writing signal and produces a trigger signal in case the address bus information gets out of an address range shown by the 1st address information or an address range shown by the 2nd address information. A memory circuit 4 always supplies and stores the address information and the data bus information given from a microprocessor system. Then both bus information are stored by a prescribed amount accumulated from a time point when the trigger signal is generated. A memory control circuit 5 reads the memory information out of the circuit 4 to output it to an output device like a typewriter, etc., and also controls the writing timing of both address and data bus information against the circuit 4. |
