| 摘要 |
PURPOSE:To check a program easily by displaying data on the execution of every instruction of the program to be checked on a display part every time one instruction of the program is executed. CONSTITUTION:A counter 3 is driven and step-advanced by the start instruction ST of a tracer T, generating an interruption instruction B. Once this interruption instruction B is received by an interruption acceptance part 4, a control part 5 reads an execution instruction S1 out of the starting address A1 of a program P to be checked by a next instruction of the tracer T, and then executes the instruction. The control part 5 saves data of registers R0 and R, and a stack pointer SP in a memory 6. Then, a display control part 7 is actuated by a control signal E to display data D in the memory 6 on a display part 8. When the displayed data has no error, a keyboard 9 is operated to generate a start signal F by the display control part 7, thereby displaying the execution state and results of a program to be checked on the display part 8. |
