| 摘要 |
PURPOSE:To remove the useless masking of a travelling level, to improve the travelling efficiency of a program and to strengthen processing ability by detecting quickly the operation of the program in a travelling level other than a premised one. CONSTITUTION:A program travelling level key LK is set up in a register 8 and the execution level of a communication control processor CCP is set up in a register 9. A travelling level checking part 10 compares the contents of both resisters 8, 9, and when both contents are inconsistent, executes an interruption so-called ''program travelling level check''. Namely, abnormal detection is executed. If the execution level of the CCP is level 3 when a network control program NCP tries to operate in a travelling level 5 e.g., the program travelling level key LK does not coincide with the execution level of the CCP, so that abnormal detection is executed. |
