| 摘要 |
<p>PURPOSE:To continue a processing without returning to a first procedure while the processing is interrupted even when a power source is instantaneously stopped by being provided with an interruption preventing circuit and a storage means to store the number of a present processing procedure. CONSTITUTION:When a power source 6 is turned on, a resetting signal (b) is inputted from a power on resetting circuit 4. Since a microcomputer 5' reads a signal level (e) of a port P0 of an MPU 1' and is an H level, the computer starts the processing of a processing procedure No.1, thereafter, performs the processing successively, and stores the number of the processing procedure at that time into a RAM 3 each time the procedure is shifted. When instantaneous stoppage is executed during the processing execution of a procedure No.i, the signal (b) comes to be once an L level, comes to be an H level immediately, and therefore, the level (e) is read again. At this time, for a capacitor C of an interruption preventing circuit 8, a terminal voltage (c) is a value a little lower than a maximum voltage due to the immediate end of starting the discharging, and therefore, the condition before the instantaneous stoppage is held for the level (e) of the port P0. Thus, the processing of No.i is intermittently executed.</p> |
