| 摘要 |
PURPOSE:To facilitate the maintenance and inspection, by having a low speed of execution for a program of a microcomputer that controls the working of an image forming device via a changeover switch and therefore realizing a visual check of the executing state of the program. CONSTITUTION:The executing speed is switched by a switch 10 for the program of a microcomputer muCMP7. The muCMP7 has a normal speed and a low speed when the switch 10 is opened and closed respectively. The address and data signals given from the muCMP7 are selected by a switch 12 and then stored in an address latch 5 and a data latch 4 with its selecting timing through the switch 12. Then light emitting diodes 1 and 2 are lit up through a decoder driver 3, and the lighting period depends on the period of the output signal of an oscillator 9. The muCMP7 stops its operation while a switch 11 is pushed. Thus the address and data which are under execution can be confirmed. As a result, the maintenance is possible with high efficiency without using a special measuring device at a working site. |
