| 摘要 |
PURPOSE:To extend the life of unvolatile memory, by determining a display value from the read value of unvolatile memory for renewing a memory place every time at every predetermined running distance to store the same and the memory valve of a protective memory means for storing said place at every specific integrated running distance. CONSTITUTION:The pulse of a pulse generating part 1 for generating a pulse signal corresponding to the rotation of a wheel is counted by the counter 3 in a microcomputer 2 and soft is performed by the program in ROM5 and MPU4 while a running distance and an integrated running distance are operated corresponding to the count number and displayed. Further, for example, an address is successively renewed at every 100m and written in the unvolatile memory 7. In addition, when a power source is closed, said address is read to RAM6 at the time of resetting and used as integrated distance data as well as written in second unvolatile memory 10, for example, at every 20,000km through an erasing processing signal lock circuit 9 and read at the time of abnormality to be displayed. |
