| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a time of rewriting to be performed after writing operation is interrupted once, in the writing operation to a rewritable memory having a redundant system. <P>SOLUTION: When transferring a program stored in a storage device 33 from a central processing part 31 to a first memory part 11, the central control part 31 stands a flag 32a showing that the program writing operation does not normally end inside a central processing part peripheral part 32 by a control signal (an ACT signal) from a first system changeover part 13 when the first memory part 11 is system-changed to a second memory part 11 to interrupt program writing into the first memory part 11. When the central processing part 31 rewrites the program into the first memory part 11, the central processing unit 31 watches the flag 32a to recognize that the preceding program writing has not normally ended, reads an address in the middle of performing the writing operation last time at the last, and stored in a first storage part 12, and starts the program writing from the address. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
