| 摘要 |
<p>PURPOSE:To reduce the hardware of an emergency control part and also to improve its reliability by avoiding contention between initial setting operation and microprogram actuation in initial setting operation. CONSTITUTION:Emergency control part 7 is provided with initial setting indication circuit 1 started by an emergnecy control cuase or initial program load request and when the control cause or program load request occurs, circuit 1 is operated to generate 1st and 2nd indication signals 3 and 4; and signal 3 is applied to initial setting circuit 5, whose output keeps on setting the zero address of the content of MPC11 of microaddress sequencer 10. Once the transmission of the set signal of this circuit 5 ends, a program stored in a specific address of ROM11 is executed. Then test instruction 15 included in the program is applied to decoder 17, the indication code of indication signal 4 is also applied to decoder 17 via test field 16, and the test output is decided by specific address assignment circuit 19, thereby sending it out with the reliability of emergnecy control improved.</p> |
