| 摘要 |
PURPOSE:To perform address control, by adding the 1st flag bits for indicating a starting address to the starting data block of each data segment and the 2nd flag bits to a block at a distance corresponding to an address code from the starting data block. CONSTITUTION:Respective data segments DS0, DS1, and DS2 are provided with the 1st flag bits 33 and the 2nd flag bits 32 for block addresses corresponding to their segment addresses. When the power source is turned off and then turned on again, the 1st flag bits 33 are read out of a block address counter BLC23. The value of a stop segment address counter SAC23 is known from one-to-one relation. The number of shifts is added to it and the sum is set in counters 23 and 24. Once the 2nd flag bits 32 are detected, the address code of a segment in a small minor loop is found and set in a counter 25. Thus, the address control is protected against a break of power supply. |
