To prevent overwrite deletion of the data by the occurrence of the just before accidental event by using a ring buffer.
The data memory device 1 comprises: a memory part 10 including the first and the second memory areas; a cyclic writing control part 40 which writes the received data to the first memory area 20 from the top of the data area arranged one dimensionally to the end successively and again starts after reach the end, and the control is interrupted when the prescribed event happens; and a final writing address memory processing part 50 for writing the address of written data into the first memory area 20 before interrupting the control is written into the designated address in the second memory area 30. When the control part 40 receives the continuation resuming control signal, controls for making resuming the writing by determining the address at the time of resuming based on the final writing address specification information stored in the second memory area 30.
Mitsue Obuchi
Tatsuya Ina