| 摘要 |
PURPOSE:To prevent an electronic apparatus from causing a malfunction, by detecting a microprogram memory and a micro-instruction register, irrespective of execution of a program. CONSTITUTION:Prior to an operation of an electronic apparatus, a counter 6 is counted up successively. A selector 7 selects an output of the counter 6 and outputs it as an address of a microprogram memory 2, a micro-instruction corresponding to its address is read out of the memory 2 and inputted to a micro-instruction register 3, and the number of signals of a significant level in the micro-instruction is integrated by an integrator 9. When the counter 6 counts up to the last address of the memory 2, a decoder 8 detects it, and an output of the register 3 which has held an expected value of a result of integration added in the end, and an output of the integrator 9 are compared by a comparator 10. When they coincide, the selector 7 selects an output of a sequencer 1 and outputs it as an address of the memory 2, and a control is started. |
